I changed to 5 about 4 years ago. I will confess it took me about 2 years to "remap" my brain from 4 to 5 but I personally haven't regretted it at all. One nice feature about the B sting for me anyway is the ability to play a fretted low E. Hope I described that correctly. Up until then when I would play a low E it was always as an open note and if I wantd control of it I had to deal with string to mute it as I hit it. No more so now I can do both. The open E is great for a sustained note or just that woe feeling of an open plucked string, but a controlled E is very suefull as well.
I find I use the low D a lot as well and finally if you are playing on the D string but a ways up the neck you have the ability to reach under your note for a lower octive with almost no travel.
I recently got a 4 string to play on for back up and now realize that I don't want to play a 4 string anymore.
All of these thoughts are just my own reflections on what works for me. You may and will have different views.
Good plucking....