Increase cooldown on low-cooldown skill

For all those who think I lose to wizard and crying about it, you are wrong. I'm a wizard myself, and I find it too easy for the wizard to spam gush all the way to kill any mobs because they have the slow effect and yet small cooldown too.

And no, I do not say all skill with low cooldown should have increased cooldown. I was refering to a specific few groups of skill, but the thread title is not long enough to explain it all so I explain in my opening post, please read it before replying. I already give argument that counter yours in the opening post too.

It would be too long to list all class skill here that I want increased cooldown, so those skill belong to magic class I would pay attention to first here because other 3 non magic class have less skill that need increased cooldown.
These skill are those I target specifically for the 3 magic class:
Bramble Guard: something that last 10mins yet have 1 sec cooldown don't make sense. At least make it match the cooldown of Purge to make the cooldown actually have a purpose (so 120sec at level 1 and 30 sec at level 10 cooldown).
Vanguard Spirit/Magic Shell/Celestial Guardian's Seal/Spirit's Gift: all 30mins duration but an insignificant cooldown of 1sec, again make it at least match Purge's cooldown.
Greater Protective Aura/Aegis Spirit/Exalted Renewal/Arcane Empowerment: 1hour buff with only 5sec cooldown, the cooldown is really too significant. Being a AOE buff, it make sense to not just match it with Purge's cooldown, but make it slower than Purge. I would say these should have 2x Purge's cooldown.
Blessing of the Purehearted: quite an useless skill but it is easily seens that it is meant to be used in very limited situation. It is an inefficient heal that have long channelling time, but it heal instantly the most, so the only time you need to use it is to cast it pre-emptively to deal with 2 strong attack that you know coming when you already stack 5 ironheart on, and when well spring surge is not enough to deal with it. In any case, it is essentially an emergency heal, so it should have long cooldown, such as 1mins.
Great Cyclone/Gush: a great slow effect yet have only 3 sec cooldown, which means you can keep target under slow permanently and kite it indefinitely. Should at least make it have cooldown longer than the effect duration, so I suggest 10sec.
Puroshell/Glacial Embrace/Stone Barrier: same 15mins effect with an insignificant cooldown. However these have Chi cost so the cooldown can be less than Purge, but still have to be significant. 1/2 Purge cooldown seems reasonable.
The Dragon's Breath: too low cooldown for a zhen skill that will almost always last more than 15sec. Because it cost only 1 spark I suggest it have more cooldown than cleric's, so 1min cooldown.
Frostblade: 3sec cooldown for a skill that last 15mins at least is too insignificant. Because this buff is less significant compare to cleric's the cooldown can be lower than Purge, so 1/2 Purge's cooldown seems fair.
Undine Strike: strong yet too spammable. The effect is 12sec so it should have more cooldown than 12sec. I suggest 15sec.

Regarding attack skill, I find these class have enough attacking skill that they have no reason to spam a single skill. If the cooldown is short as it is now they will just spam the most efficient skill all the time, instead of making choice. Short cooldown should be applicable to only skill that is inferior to attacking that long cooldown skill but come on: gush is better than pyro but it have same cooldown; undine strike is strong yet have shorter cooldown than pyro.
Regarding Bramble Guard: adding cooldown add more to the challenge. Hardly I see situation when the whole party need to be buffed anyway, if anything barb is the only one that want the buff, because other class want to lose aggro as much as possible.
Regarding buff: buff can be purged, which make in TW situation the buff expected time is short enough that cooldown can be a problem, that is why I suggest making cooldown longer to balance it with purge. I already don't see the point of having some buff with 3sec cooldown and some with 5sec cooldown, as if the 2sec difference will means anything when the buff is 15mins and purge is 25sec at least. Increase it won't make a lot of different in PvE: you take a bit more time to start a run but it is minor annoyance at most; while during the run party member will expire buff at different time so you never have to buff all of them at once.