Glad you like it. Like all systems, it has its positives and negatives, but I tend to like it much better than copper overall.
Also glad to see you went up to 3/4" pex, this was an appropriate time to do so. The 1/2" feeds to the individual fixtures is good.
I will echo hj though, that you really don't need, and certainly don't want, all those fittings. I use plastic nail on talons to attach the pex to the studs in a situation like your tub on both sides of the turn. I generally skip the bend supports, as long as you don't kink the pipe, you don't really need them, though the manufactures want them there. I even manage to make 90 degree turns between 2 2x4 walls like you have pictured w/o fittings. You usually have to drill the hole through the 2x4 on a downward angle, if that makes sense, so the pipe would end up 6" to a foot higher/lower on the 2nd wall. That allows you to do a nice gradual turn through the corner. Takes a little practice and a little fighting with the pipe to get them through sometimes, but I think its worth it. You likely won't want to try to make 3/4" go through a tight corner in a wall like that though - its tough. I do it in some cases, but you'll probably end up kinking your pipe if you try it w/o much experience doing it.
My house is a homerun pex system, so each individual fixture has its own cold and/or hot line all the way from the basement. With only one exception, there are no fittings between the manifold in the basement and the fixture's local shutoff. That one exception was a very tight turn through a 2x3 partition that just wasn't possible to do w/o a fitting. Its a 3 story house with lots of offsets and goofy pipe runs, as they didn't really build houses for convenient piping back in the 1860s...
If it were me, I'd probably redo your piping while you have the chance, with fewer fittings. Some ways to make this easier... instead of running your lines to the shower valve straight up, bring them up in further over stud bays and run them through a stud (or 2 on one side in your case) to the valve. This will allow you to make nice gradual turns, and the piping going through the studs will keep everything lined up nice w/ no pressure on the valve connections. Like I said, nail on talons for those turns around the tub... those 4 elbows there can definitely go. Think through how to make nice gradual turns anywhere you can, and do it.
Fittings are for copper