I can't test it now, but does spacebar (center on recent event) work for Nydus Worm/Nuke? (eg. if i got nuked or wormed, can I find it by hitting space)
I've never had any success with space bar finding a nuke. I think a lot of people were getting confused by the fact that, if you did not tell your ghost to "hold fire", he'd fire off some sniper rounds before the nuke. If that happens, your opponent can zero in on the "units under attack" event with the space bar. From there, it gets pretty obvious what's happening.
Nydus worm is the same situation. You can zero in on the attacks happening after the units start pouring out of the worm, but not on the worm coming out of the ground itself.
Nuke launch creates event (it's displayed on left side and subtitles) and you will see a target of nuke by hitting spacebar (at least at 1.2.0 path, didn't tested after) If there is some other event occurred after nuke - just press space bar once again to cycle through events. Or just click on icon at the left side.
This trick doesn't work with nydus (it's just a sound - no any event produced).