I would get one.
I got stuck last night going down a class 6 road in CT. Everything looked fine, I was about to turn around and see if I could find another way through because it looked like the road was getting pretty steep and I was reasonably sure there was a washed out bridge further down, so I went a bit to the left to hang a U-turn in a clearing and... stopped. There was a pile of brush and leaves on top of a tall stump that I didn't even see. Got stuck pretty good (no lockers in that jeep, nose down on a hilll with a solid stump wedged under the front crossmember) and ended up rocking it back and forth and digging with my hands till I could get it backed up far enough to turn sharply and miss the stump. Drove right back out, but was definitely quite worried for a few.
If I'd had a winch I would have been out in 5 minutes instead of an hour plus, and wouldn't have torn up my hands and arms digging in semi frozen muck in a pile of thorn bushes...
EDIT: PS, high lifts are dangerous if not used very carefully and I would rather use a winch when possible... faster, easier, safer since you can use it alone and have the motor pulling as well, and will get you much further. If you blow a trans or a motor you are still screwed, that's why you should wheel an MJ, just bring spare ones with you.