Dressphere changes are much better when you turn off the effects. There's still that brief pause, but that's not so bad.
Lady Luck is best when grinding because of it's high critical hit rate and Double EXP, Items, and Gil!
Yes, I turned off the transformation animations after seeing all of the them at least once. The battle system flows a lot better when there only brief pauses between a job change rather than a full cinematic sequence.