I kinda went totally opposite of these guys. I've been playing a 5 or 6 for roughly 30 years. I had to have the low B because I fell in love with Dream Theater's music, and had to have the B. I started searching for other players in recordings and started learning tunes written for a B, on a B. Got me familiar very quickly, most of that learning when to use the Low B as a thumbrest to keep it from ringing, modifying my left hand technique of using the tips of my fingers to mute strings, reaching the B feels different. And just getting my mind around the fact tho notes have moved, down, the notes are still notes. I then went to learning down tuned songs without downtuning, forcing myself to see new patterns and applying this knowledge at gigs. We're playin an SRV set tonight? I play in E flat positionally, I don't tune down. Drop D, Drop C, I don't tune down. I went from takin 4 or 5 basses to gigs to keep up wit our guitarist's arsenal of tunings, to takin one bass that had all the keys, like a piano, and it's saved me a ton of work at shows. Knowing hindsight is always 20/20, I learn by ear, then apply my technical knowledge to categorize the tune. In the same way, I just played tunes in B and then applied that knowledge to moving other songs, making them easier. I use the B to avoid position shifts, sure, but what that really means in practical knowledge is that I don't have to stare at my neck to play difficult passages. Music is music before it's a technical exercise. Play the bass, listen for your weaknesses, and find ways to eliminate them.