Hi Bill,
I do appreciate where you are coming from re: sand. If I am at a shooting range with a table in front of me, I drop the magazine on the table rather than the floor. Dropping the magazine seems to be the least critical part of a quick reload. Inserting the new magazine is more complex.
I like and carry both 1911's and Glocks. More often than not, it is a Glock for the rock-solid reliability and because my 1911 is full-size while my Glocks are compact and subcompact. However, the 1911 is definitely the easier gun to shoot well. I totally agree with you about the safety issue: more has to go wrong for a cocked and locked 1911 to discharge than for a Glock to discharge.
Here's another thing to consider re: safety:
Part of my wife's family is from Indiana, and to get there I cross Ohio. There, the law requires plain sight carry in a car, and I have been reading of cases of LEO's taking possession of the guns during traffic stops (they return them after the stop is over, as required by law). With a Glock, there is a 2 in 3 chance that the LEO who takes the gun has been trained to use that brand as their duty weapon. I'd hate for an LEO who isn't trained on 1911's to decide that he needs to "decock" the 1911. This, however, is probably only an issue in this unique circumstance.