In fact, I'm friends with a French Horn player, who's subbed with almost every orchestra in the Bay Area. I'm pretty sure he doesn't get a rehearsal.
We're doing Boheme? No way I'm doing that without a dress rehearsal. Every opera singer screws things up in their own special way and I need to know what to expect.
We're doing anything by Stravinsky? I'll take every rehearsal I can get.
When I played it as concertmaster I felt that it was my duty to ensure that at least one person was hitting all the notes though. Never practiced so much for a concert as that one... and that's why even many years later I feel ready to show up and play it on a moment's notice.