Originally Posted by
Forgettable
Yes, there are many instant casts you can do. To name a few:
1. Ice Nova, instant cast (Once every 25 sec, 2 charges)
2. Water Jet + Frostbolt x 2 = Two Fingers of Frost procs every 25 secs, which translates into two instant cast Ice Lances.
3. Frozen Orb (1/min guaranteed FoF proc minimum, likely more) = Instant cast Ice Lances. Frozen orb on its own is also instant cast.
4. Ice Floes 1/ 20 secs, 3 charges.
5. Mirror Images 2min cooldown, instant cast.
These are the cooldown based ones that are guarenteed - This doesn't even count RNG proccing additional FoF or Brain Freezes for even more instant casts.
You should have no problems with movement if you talent into it for movement heavy fights, which is most of them.