My other hobby is restoring old cars, (which I haven't been able to indulge in recently). I do it because I like doing it, and good tools make all the difference. It's the same for anything that you're doing because you enjoy doing it, the best equipment will enhance the whole feeling of it. There's something very satisfying about a lens, film advance, or an automotive tool that works impeccably and feels like quality in your hand.
I have a couple of modern AF lenses that have that scratchy feel when focussed manually. Compared to a lovely old Takumar I use regularly, they feel like junk, and it feels less satisfying to use them.