who hates limping?

i attempted to post about this earlier, but it seems to have disappeared.

i want to know when you guys/gals think it is appropriate to limp. how does the structure of the game and table composition affect your decision to limp or not?
i've heard many times, "if it's not worth raising, it's not worth playing" but aren't there lots of times when you want to see the flop cheap against a lot of opponents? (small pocket pairs, connectors)
i'm pretty sure limping is more prevalent in limit rather than NL, and in tournaments it's a totally different animal as well.
any thoughts on this?