The Enterprise spacedock escape / Excelsior chase sequence is one of my favorite all-time Trek moments. I think James Horner's score has something to do with it. On a bigger screen, there's a certain scale of massiveness that one feels when the Excelsior start thrusting forward.
The first uncloaking of the Bird of Prey was awesome. I don't think it has ever been depicted better. On the other hand, the bridge of that ship changed from this movie to the next. I also think the Enterprise self-destruct (exterior view) was nicely done.
