My real thing, the thing that makes me happy, makes me want to play has nothing to do with amazing tone. Almost any bass with a pickup approximately where a P pickup is, that I've set up how I like, into a decent clean amp and cab is good enough. It's the other people.
What it's all about for me is that moment when you're playing with a great drummer you have good chemistry with, and a good guitar player, all three (or four, etc) of you are listening to each other, locking in, making instantaneous adjustments so everything works effortlessly, you're playing a song that grooves, and you all hit the first note of the next section right on the money, without needing a cue, or you all hit that cool stop...wait...wait...wait..boom! back at exactly the same millisecond like you can read each other's minds. That's the real thing. For me.