I have long held a fascination with the more exacting technical aspects of the AD&D 1e system, like time segments, and the more granular weight measurement, but after recently attempting to run the game by using those very elements straight, I've found them to be much more trouble than they're worth. Not the least of which is that they simply bog down the game in the middle of a session. The rules as presented in the books are also rife with exceptions, special cases, and obviation, such that one could feel that they were never really run as written anyway.  I originally viewed AD&D 2e's simplification of these rules with askance, but now I've come to accept that what is lost in true simulation is made up for in straightforward use during play.

I'm disappointed that there's so much interest in 1e yet so little in 2e, though from what I've seen most people want to play 1e just out of a morbid curiosity with little true attachment to the game.