Three and a half years break from playing it for me (other than the odd noodle at home). It really has made me appreciate it more.
Spurred on by my use of the fretless at the last rehearsal and gig, I carried out a comparison experiment that you can’t achieve under normal gig/rehearsal conditions, just to check if it wasn’t just the different feel and tone of the instrument that was making me feel so good about it (emperor’s new clothes and all that). I copied an old live recording I had from about 10 years ago into GarageBand, sucked out all the bass frequencies and recorded 4 new bass lines, using different basses, both clean and driven. I was surprised by the results. Not only did the fretless sound better in the mix than the fretted bass, both clean and driven, but the driven, fretless tone was the out and out winner.