Is there ANY point to hacking computer terminals such as the one in the Goodsprings Saloon? I can't find anything about them on FNV WIki, and so far the few terminals I've encountered and hacked yielded nothing of use.

For the XP.

Or to unlock associated locks.

Different things: to unlock associated locks, to activate/deactivate turrets, to get various info and similar.

I have found many of them pretty much useless. Only about 1/20 (my estimation) actually unlocks something...I'd much rather have high lockpick than high science for that very reason. Baring monetary gain, you do usually learn somthing about the faction that the terminal is located at or info about the location your at prewar. You can get some pretty interesting reads out of some of them...though if you don't care about that stuff....