Indeed.
You know what really surprised me a year or so back (though this probably is no earthshaking revelation to most people)?
-- The effect different picks have on sound.
I'm talking more about guitar and acoustic guitar. I only use a pick maybe a quarter to a third of the time with bass, but I noticed it on bass too.
I was just really surprised how much of an impact pick thickness and pick material have on overall sound.
It was an easy test to discern too, as I was using the exact same instrument, amp settings (where applicable), etc. ; just different kinds of picks.
I now have a fairly impressive pick collection which I acquired without even intending to.
***Incidentally I do find these differences are more pronounced on my acoustic guitar than on my electric bass, but the differences are still obvious to my ears.
That is no joke. I sometimes wonder how many players who've tried a pick and hated it might feel differently if they had tried a different pick. The difference between a cheap Fender guitar pick you find in any guitar shop and the 3mm Dunlops I use is like night and day, and that's without a really major difference in material.