I actually came back just to cover how absolutely horribly bad Crawling Infestation is, saw you post and.. yeah. It's really horrifically bad.
The range is terrible, it fails all the time, anything and everything seems able to remove it if it if you manage to put it on an enemy, it can only be used once per combat (even if it fails!) and.. that's really it.
There's a lot of questionable changes with Enhanced Edition, but Crawling Infestation has to be the shittiest thing out of all the new additions. I have no idea what they were thinking.