I need to argue very much in favor of gnomes, eventho i share your distaste for the asthetics.
As a mage, you are by nature very versatile and with paladin supporting you, a good alliance mage is already close to untouchable.
Yet here's the deal why Escape Artist just gives you the little extra edge.
Here's the scenario:
You are playing in a premade, doing the king of vanilla batllegrounds (warsong), which provides a mage with certain tasks, that you are excelling even more at with having escape artist.
1. Horde Team is sitting in defense with Lock/Hunter on Ramp and a rogue in the flagroom, Their elemental shamans and warriors dominating midfield. Your druid would have to waste too much cds(&mana) to get the flag out so he won't survive the collapse in mid.
Here you come into play. --> Double iceblocks, blinks, insignia, skull AND Escape Artist gives you so much versatility you can bring the flag out in any defense situation (unless its a fullon turtle, but even then you are the best choice)
2. You are the designated flag carrier, for lackof a proper druid on the team. Your Insignia, Freedom and Iceblocks are very powerful tools indeed, but let's just say for the sake of argument that providing the flag carrier with the freedom puts yourself in a very defensive position that you don't want to take.
Escape Artist is the difference between life and death in these situations, no matter if its cripplings, blankets+nova, hamsterings - its simply gamebreaking.
A properly played gnome mage is a god in warsong, the enemy team has to have impeccable positiong and coordination to deal with you in time, therefore you alone are putting enough stress on a team.
I won't say a human mage can not have this kind of impact, but it certainly easier to be catched.
Perception might be useful, to deal with less skilled rogues in defense but on the highest skillcap, you rather want to be able to react than act.