Another fan of Mil-R but I normally dial for elevation and hold windage so it works well. I grew up on mil dot and never had a problem with it. Having used several different tree reticles, I think they would be excellent if I just used them for a while. But, I kinda like the unobscured view with the Mil-R for spotting and the occasions when I've held for elevation and just a mil or so of windage I haven't had a problem. If the wind is big I take the time to dial elevation so I'm not guessing in the "clear spot". I don't have to do much time critical shooting - at least not to the point that I've felt the Mil-R a big hindrance. Just my .02...
My story is quite unique, way back when, when there were few affordable choices in FFP scopes, I ended up with the old Horus scopes. Most of the ones I had didn't track too well but the reticles were right on the money. So I was forced to learn and use holdovers and holdoffs if I wanted any success at all. I practiced and got used to and good at holding over and holding off. For the most part, especially off a bipod, doing so works better than most would think. It's really a matter of training.
3-4 years later the H59 reticle came out. I started winning matches and won a couple long range series events, very rarely dialing, except for our 1100Y steel. There's no way in the world I would have won using standard reticles by holding over and holding off. It's the reference of .2 hashes in the grid that made that possible and when I missed the measurement I needed from POA to POI was there to be used.
Other factors that I attribute to my success back then was I "had more time" since I wasn't dialing.
To appraise a good wind call, as well as build a more solid position, and identify the correct target to engage ,or to think about what I was doing to avoid mistakes.
I admit I dial much more nowadays, especially for positional stages, which I'll even dial wind for so I can snap the shot while centered, but I have the H59 reticle to use for holdover/off if need be. I also use the .2 windage hashes when I dial elevation for holding off.