I still don't use ack, mostly because it's not installed everywhere I go on a regular basis and so my fingers still go 'grep' when I think 'text search'.
(I also rarely use curl, because my fingers are trained for wget -qO. That one is a personal quirk, though, I didn't know about curl until I'd had that one imprinted on my brain. The cool thing there, though, is that wget -qSO will send headers to stderr and content to stdout, so you can get fancy.)
Not to mention vim, rsync, curl, and ack, all of which I (and I had assumed everyone else) use on a regular basis.