Like the guy before me, its big, its messy, theres a whole lot of totally useless stuff in it, too many buttons and it looks like u really click your pets abillity.
Having a big mana bar could be usefull but if you play your mage right theres no need to even have a manabar atm.
1foot=30cm, a good distance is like 50cm and more!
If you need a big UI to see from 30cm you, and thats no offense, really need to go to your eye doctor because thats not normal.
Its not your job to look at their health
Its a thing i also had to learn when starting to dps (and i cant disable raidframes yet
) but the best dps ust does what he does until he dies. Looking at peoples health is distracting and hesitating or giving up while the whole raid is dying can make the difference between victory and 1%wipe.
get vuhdo, afaik u can configure it to only show some debuffs. im not using it so sry i cant help u more in deph with it.
To show you what you are doing here u have an example of how you UI looks(not ThAT bad though
):
http://img168.imageshack.us/img168/5716/watlt5.jpg