For some actors, the greatest compliment you could pay them is to tell them breathlessly what a huge fan you are, then to list of everything BUT what they are most well-known for. I have a feeling Sarah Michelle Gellar and Leonard Nimoy would be two of those people.
Mokalus of Borg
PS - Sarah Michelle Gellar doesn't attend any Buffy events like conventions.
PPS - Leonard Nimoy has publicly announced he's stepping down from a character he first played decades ago.