Like I said, the Glock (particularly the G17), like most modern combat autoloaders is very reliable, but that's no excuse for not practice clearance drills (or for suggesting or even implying such practice is not necessary). I've seen two of different people stand around like absolute idiots when their Glocks choke because they thought "Glocks don't jam," weren't expecting it and literally, did not know what to do.
BTW, I wouldn't rely on old practice with a different model handgun to get me through a malfunction. Just because it hasn't happened to you yet, doesn't mean it won't. There's just enough difference in the controls to cause you to fumble when you can least afford it.
FWIW (and since you seem bound and determined to bring 1911s into the issue), in terms of out of box reliability with modern firearms, I've had better luck with 1911s (Colts and Kimbers) than I have had with Glocks--as I mentioned previously, I bought one Glock that was absolute lemon out of the box which hasn't happened with Colt or Kimber (yet). I've also found that 1911 magazines tend to be more tolerant of dusty/sandy conditions than Glock sub-compacts (but that is not necessarily a fair comparison because of difference between a full-size 1911 and a sub-compact Glock). Frankly, if I went down and bought a new Colt 1991A1 and a new Glock 17, I'd equally surprised if either one had reliability issues.