A lot of us were trained in FFXI and v1 to move only when it's necessary. In PvE, which is all we had, you don't evade normal attacks by bouncing around chaotically, and many skills require you to be stationary. You move when you need to: to dodge AOE, exceed spell range to interrupt (when the cast is long enough to do that), and kite.

The only time I've taken issue with it (other than how ridiculous it looks to see someone do it) was when our Archer kept frantically moving in and out of spell range, and occasions where he'd break my line of sight to him by going behind me or some terrain obstacle. IT made it very difficult to cure him when he needed it.