A bit off topic but close enough for me to relate this story:
I learned on, and played (exclusively) 4-string basses for maybe 19 years before buying a 5er. The 5 was then my only bass for almost 25 years until I bought a 4 again a few months ago. It's only now I realise that over those 25 years I was never as good as I was on the 4. It might be due to a lot of things: poor technique on my part, the particular 5 I have, the setup, my weird brain (see second paragraph)... All I know is that listening to some old recordings, I played better 25 years ago and I'm playing better now. I'm quicker, more precise, better able to predict/find the right note when jamming or playing by ear.
Now, I fully accept that I may be the only person in the world who thinks like this, but when I switched from 4 to 5 I noticed that my left hand plays from the G while my right hand plays from the E/B. For example, to play a note on the A string on the 4, my mind (or body) somehow knew: push down on the third string up, and pluck the second string down. When I started playing the 5er, my left hand knew the A was the third string up, but my right was plucking the E. After years of occasionally glancing at my left hand and leaving my right to do its own thing, I was now staring at my right hand consciously thinking about what strings to play. It took me a few days of practising for a couple of hours a day before I could pick up the 5er and be "in synch" from the first note. Conversely, after playing only the 5 for so long, when I got the new 4 string it felt natural after about one minute.