OK, to help a little in this discussion, I will list all utility spell (control exclude).
Raid Wide Utility
Arcane Brillance - Intellect and Crit buff
Time Warp - same as BL/Hero (shaman) and Ancient Hysteria (Hunter)
Invisibility - for Mass Rez after a wipe. Same as Feign Death.
Portal - send player in your group in an important city. Less usefull because of Fly Mount and all TP stuff (cape, tabar, ...)
Refreshment Table - bring food. less interresting than crafted food.
Fight-Utility
Counterspell - CS
Polymorph - CC
Remove Curse - dispel Curse only
Spellsteal - dispel beneficial Magic on Hostile target at cost of heavy mana cost
Symbiosis - big heal every 5s
Slow Fall - like levitation without water walking
Self-Utility
Blink - remove stun & root, "Fire is Hot" skip
Ice Block - immunity every 5 minutes (3 minutes w/ Cold Snap)
Invisibility - for Mass Rez after a wipe. Same as Feign Death.
Mirror Image - threat reduction
Spellsteal - dispel beneficial Magic on Hostile target at cost of heavy mana cost.
Teleportation - go to a city
Mage Armor - 25% reduced duration of Magic effect (35% w/ glyph)
Molten Armor - 6% physical damage reduction (16% w/ glyph)
Blazing Speed - like Blink w/ Immunity and not on GCD but w/o "fire" skip
Ice Barrier - absorb 100k damage every 25s
Temporal Shield - heald back damage taken
Cauterize - not-dying once every 2 minutes
Cold Snap - 15% instant self-heal every 3 minutes (was 30%)
Greater Invisibility - remove 2 DOT and 90% damage reduction every 1.5 minute
Glyph of Evocation - self heal for 60% (6s cast, 2 minutes), 20% (3s cast) or 1% per second.
Glyph of Invisibility - 40% speed-boost every 5 minutes (1.5 minute w/ talent)
Glyph of Rapid Teleportation - 70% speed-boost after using a portal
Personal conclusion
All raid-wide spell are shared or useless.
Fight utility spell is all shared (CS/CC/slow-fall), less useful (dispell).
Self Utility spell can be sorted like this:
- core mage ability that are unique to mage.
- pvp ability (or very situational)
- defensive talent, surviving talent and glyph
6 spells can resume mage self utility.
Hybrid class is very useful because they have to multiple role.
In the only-DPS class, we have:
- Hunter with every buff & debuff, threat redirection, Feign Death, etc
- Rogue with Smoke Bombs for Line of Sight and 20% raid damage reduction (5.2 ptr), threat redirection.
- Warlock with Summoning, 20% free heal on-use, Gateway and battle rez