Looks like the butterfly was doing a little sugaring too. Nice video. I think the first one is either a red or a silver and the second tree looks like a sugar maple. Those trees aren't dead, and I'll bet the amount of sap you took out of them affected them very little. They take a little while to leaf out. The little trees seem to leaf out first, followed by the really old ones. I had a popple that I thought was dead. It was holding up a fence on my woodlot and I thought I would have to cut it down. It finally leafed out way later than the others and saved me a lot of trouble.

Hang in there, it seems like a watched tree never leaves, but it will leaf out some day soon.