I use barely nething and get around fine lol.

Jamba - cause of group and the big old ding hey you lost someone go back and get them.
Questhelper - on one toon and one toon only so i can get to quests faster.
Xperl - yes i love being able to watch on my main my toons casting instead of looking at their screen.
Recount - Go go dps
Dbm - Main only to know what boss is doing.

I think thats it i went back to regular UI works perfect for me no clutter not alot of memory usage.