I do think that you need to separate the pnp RPG crowd and the LARP crowd, while there was some overlap, and people of one group often tried the other's activities, in the end LARPers tended to like LARPing, and pnp RPGers tended to like pnp RPGs.
I have no idea if this was a common thing or unique to my area, but there was a collective of VtM in the midwest US that was some sort of semi-LARP. For one, I know there were some Vampire players that liked to dress up in vampire/goth gear for their games, even though the didn't do much else that I would consider LARP. I generally just attributed it to people who didn't go to raves or nightclubs wanting an excuse to get their Hot Topic on. But I've never really seen an equivalent of it in D&D. There was also a game at a community college near me that called themselves "LARP", but was really more like 2-3 separate tables running at the same time, and people would just shift which table they were at depending on where their character was going.
It's probably worth noting that I never actually played VtM when it came out. This knowledge (along with my other post) comes from an outsider who had friends that did VtM and would talk about it. But I was doing Star Wars WEG d6 at the time.