Interesting thread. When I first came to TBN, I felt the same, but for a different reason. I wanted to keep costs down. So I asked for thoughts about putting off getting the FEL for a year or two. The responses I got were very similar to the ones you've already gotten. "You'll be sorry" or "You'll wish you had gotten the FEL up front".
I didn't see it, but started the shopping process. I was able to strech my budget more than I intended, and bought the FEL up front. After more than two years of use, I'd have to say the TBN wisdom was right on. It does get in the way at times, but it is so easy to remove, that is not an issue.
A set of pallet forks for it quadruple it's use to me. What a back saver. I can now manuvre my box blade, bush hog etc. right where i want them with the pallet forks. Saves storage space in my pole barn. Since you have trees, you might also want to use it as a water carrier. I've filled the FEL with water and carried it to newly planted trees. (not an original idea, someone here on TBN mentioned it in a post.) It's also handy for back draggin my drive. But it is most useful when I'm bush hoggin my trails. I've pushed over trees, moved logs, crunched huge mutiflora rose so that the bush hog could munch em up. I'm not trying to convince you to get one, just trying to show some of the ways mine has helped me. But .... I'd guess you'd be glad that you bought it a year or two from now.
Rather than get an older 2wd model, I'd still get a newer one that you could possibly add a FEL to later. 4wd should allow you to go a bit smaller so that you can fit between the trees easier. If it were me, I'd want a 5' bush hog minimum ...so maybe I'd thin out a few trees. I had a 2wd 17hp tractor with a 4' bush hog, and for my use, it just was to light for my liking. I now have a 30hp 4wd and can easily handle the 5' bush hog. ....I have to admit, part of my problems with the smaller one was that the 17hp tractor was probably just to small / light to handle the 4 footer.