I like Radio2's music, but I don't actually like any of the regular DJs (present or past). I have Chris Evans on in the car for short bursts, but couldn't imagine listening every day to the whole programme. I also love Sara Cox and Trevor Nelson when they sit in for one of the regulars. Zoe Ball's good.
Like some others here, I was a teenager listening to Caroline and London, and once in a blue moon I catch Johnnie Walker, but after over 50yrs of avid radio listening, I find it either confrontational or tedious. Radio 4 has totally lost my heart, (there are bits I like but it's never on continuously like it used to be) and I prefer listening books.