I take mine down every year. it doesnt bother the deer. the foliage is still so think they dont hardly notice. they notice youre smell, but after a couple days that goes away and they dont even notice the stands, depending on just where they are set that is.
The weather beats on them that much more leaving them out year round. Straps dont last year to year leaving them out that long, it really can become a major safety issue leaving them out all year. Personally, I didn't realize so many guys left theirs out all year, it just doesn't seem like a good idea to me. It's a lot easier to make sure all the nuts and bolts, cables, chains, and anything else that may break or rust is in good shape if you take them down each year and check them out good before putting them up again. ratchet straps take a real beating, so i definitely would not want to leave them out all year and then rely on them not to break in the fall. ladder stands aren't as bad, but there is no way i would leave a hang on out all year. at least not without changing the straps in the fall before climbing in it.
besides all that, i also dont think of it as a chore to hang my stands every year, i love it. it's an exciting day. its late summer, i've been waiting for months to get back in the tree stands, its an energizing feeling to be out in those spots again. even if i do put the stand in the same tree, and there are some spots that i do, its just one of those experiences of hunting that i look forward to every year. if i was a deer, i would compare it to it being my prerut. nothing is really happening yet, but its the red glow of the dawn thats coming, getting ready for the one time i wait all year for. the best, most exciting, most important time of the year is just around the corner and i have just shed my velvet. hanging stands really opens up the can of anticipation for opening day.