I've been to a GB once, and 2 Bukkake Parties too but wish there were fluffers. I didn't make another private one. I've had a few threesomes here and there.
I won't rule out another GB or an orgy with many MF couples (swap or no swap), but I like more intimate scenarios such as MFM (ok, maybe another M or 2 at the most for her to hold in each hand while she's getting fucked and sucking cock) or MFMF.
But like Brill said, they can be funny too. In one party I went to, the guy's wife (who could fuck or suck a bus, or an entire hockey team if she had the chance I bet - she was oversexed) would be in the bedroom with only two guys at most, then the rest of us were drinking or having munchies in another room shooting the shit waiting for our turn. After each orgasm, she would come out and sit and drink and chat with us, and fondle here and there until the next round.