Oh man, I go to tigsource to take a break from studying for my compiler construction final. :D
I assume a lot of people use lex/yacc for their text adventure's parser generation, although it looks like the new version of Inform damn near looks like natural language processing.
Well I'm taking a break from studying for my combinatorial math final, so text parsing is fair game for me at the moment.
I figure there's pretty much no point writing out state tables by hand past a certain point, but it can be handy for people who are new to FSMs to tackle small tasks by hand for learning purposes, and you don't really need Lex and Yacc to tackle really little grammars.
The new Inform is really shiny. It makes me wish that I actually enjoyed interactive fiction. I like it from a technical standpoint, and I like fooling around with Inform, but actually sitting down and trying to play IF always leaves me feeling a little unengaged.