I’ve never been to a Siyum HaShas and have no desire to go. I expect I would be bored to death. Daf Yomi is a wonderful thing, I’m very glad it’s around, and I would consider sponsoring a daf, but don’t expect me to show up for the siyum itself.
If you want another example, though, I have felt like a spectator at a hachnasas sefer Torah and I did not find it fulfilling.