Sideliner, My son and I visited a JUCO yesterday. I think this coach explained exactly the transfer situation as any JUCO coach should be able to do. He told us what schools his kids have gone to, mentioned coaches he has relationships with, and the deliberate steps he takes to get his kids placed including travel to certain places and why, how he does fall ball, etc.
We left there feeling very comfortable about the transfer situation down the road. We've also investigated 4 yr schools and while there are a very few that aren't big on JUCOs, most recruit many of their players from JUCOs. I think it's like being recruited out of high school though, I don't think you can rely on your coach to carry the workload. You'll have to do your fair share as well with letters, calls, and followup.
Good luck with your decision!