Most "electric" station environment(s)?

[Sandman]

Definitely Black Mamba. It's so dark and ominous in there and so crazily well themed. All those sticky out bits of wood and the music's pounding. So fab.

This. Especially back when it first opened and the queue was rammed with pumped up Germans. Bit of a goosebump moment!

Nemesis at night (again, many moons ago, 2005-2006??) used to get a ridiculously lively crowd. Plus queueing right up next to a B&M roaring past you in the dark. Mmmm.

 

[mouse]

+1 for Black Mamba and Vampire. Vampire is particularly good, it really improves the overall ride experience.