I enjoy Sara Cox's evening drivetime show. I sometimes wish I didn't, but when you're doing yet another 4-hour slog up the M1/M6 in evening rush hour traffic it's perfect company.
And Zoe Ball can be OK in the mornings, although I'll often tune into something with a bit less chatter unless I'm feeling particularly enthusiastic. Other than those two shows, R2 doesn't really do it for me. And yes, Jeremy Vine is utterly off-putting.