I like it for all the old memories I have tied to it (1E, 2E, B/X). Also 2E's tons of lore and campaign worlds just gives sooo many places to play in all ready to go (as deep as you want to go down the rabbit hole to boot).
While 2E with all the bells and whistles can get very complex, if I wasn't doing 5E, it'd probably be the system I'd use. The old books could use a serious rewrite to put the rules front and center (most are buried in paragraphs, if not pages, of text) and touch up tone, but are otherwise quite usable. The magic system is just about right where I want it - powerful in later game, but certainly not an auto-take for most of the life of a campaign.
Also a huge shout-out to Old School Essentials - while I'm more of a 1E/2E fan the recompilation and presentation it does of the B/X rules is spot on to my tastes (in brevity and lightness) and makes me want to break out the likes of B4 - The Lost City and run a game, and the Advanced OSE books are pretty close to the sort of rewrite I'd like to see of 2E rules (though, I want wpn/non-wpn proficiencies).
The only thing that holds me back from going full-tilt back to those old rulesets is while they make perfect sense to me, my kids and wife recoil in horror/bounce off from those old mechanics - especially THAC0.