I had this very problem in my current 92 when I first bought it. I believe it is caused by wear in the shift tower assembly where all the shift forks and rails are. Combine this with a less than tight "feel" from the factory, and after a few hundred thousand miles (or sometimes much less), you have the slack you speak of. Some have reported a roll pin in the shift rails being about to fall out (pop the top and you'll see what I mean).
The transmission CAN be returned to neutral. You have one of two options to get it into neutral, depending on how important a speedy reutrn to neutral is. The preferred method, naturally, is to remove the shifter and stub from the shift tower and use a long screwdriver or prybar (in the 12"+ range if you got one) and pop the shifting assembly back into neutral. If you look at the end of the stub, and then look inside the transmission top, you can piece it all together. I HAVE upon occasion (like on an interstate ramp) forced the transmission back into its previous gear, and SQUARELY taken it back out of said gear. Mine was worst when coming out of 5th and 2nd. I got used to it, but my girlfriend didnt feel confident driving it, and she normally has no shortage of that.
When reassabling everything, make sure the transmission stick has no side to side slack when in gear. A little is ok, but any more than an inch movement is a sure sign of wear. Double and triple check the little screws in the side of the shif ttower and make sure they arent stripped out. A heli-coil can fix stripped threads. The bolts get loose, then allow the stick to move more than it should, causing undue wear on the shifting assembly, and then you eventually get the situation you described.
Remember the 3 "S"es for Getrag shifting-
SLOW
SMOOTH
SQUARE.
I refuse to claim credit for that idea, as I also refuse to accept credit for the Getrag vent hose idea. It is something I did, however, figure out on my own.
Nice ratio of torque to horsepower in the 94.
Daniel