I primarily gig with my 5 string fretless these days, because my music requires those low notes. I also used to think like you, "why would I play a 4 again?" Then I got a gig with a traditional-minded artist in Nashville who didn't like the image of my bass (let's not get into that please - not relevant and it's long ago), so I found a 70s fender P. It had the looks the artist wanted, but what surprised me is this: I liked how I thought and played on the 4. Moving up and down the neck where before I would move across on the 5 unlocked some sort of door for me, and my lines got much more creative and interesting. I think differently with a 4 in my hands, and I really like where it leads me.
Like I said, I still gig primarily with my 5, but I'll never be without a 4 again if I can help it, and I use a 4 a lot in my solo project.
So that's why I personally play a 4 when I can, even though I'm very experienced with 5s. It's different for everyone, of course.
... it took some time to me to master the fretboard of the 4-strings basses I play; however, now I easily travel over it, switching from key to key with some limitations in the high register due to the neck width there (in any case, running up and down the neck is a requirement when playing melodies or soloing, so it is something that we, as bass players, sooner or later have to come to terms with)..
A 5-strings bass extends the instrument’s possibilities in the low register (in a context where the extra notes can be discerned), but I frankly don’t see many other extra advantages of a 5-strings bass over a 4-strings one.
Edit:
Maybe, as Scott Devine says, I’m just too used to 4-strings basses and I’ll think of a 5-strings one as a 4-stringer with an added string, which, in my case, will likely become a long thumbrest.
Here’s his point of view on the matter, which, I believe, is substantially neutral:
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