But that's a flawed argument. If we finish eating, then continue to sit around the table talking for 10 minutes, then at that point, we are occupying the table for longer and possibly making someone else wait for us to leave (assumming a very busy meal time where all the tables are full). But if we occupy the table for an extra 10 minutes BEFORE eating, that has nothing to do with the person looking for a table at the END of our meal. When we get up and throw our trash away and leave the restaraunt, it makes no difference to the next guest whether we initially sat down at the table at 12:00 or 11:50. In fact, by having my family get the napkins, condoments, etc, and sit down 10 minutes early, we have just seen to it that we will be done with our table 10 minutes early, thus opening up the table for the next guest SOONER.
Think of it this way: say it takes 10 minutes to stand in line, order and get your food. Then it takes another 5 minutes to get all situated: stake out a table, get silverware, napkins, condiments, etc. So 15 minutes to get seated at the table. But what if we split the party up and take care of those things simultaneously? The 5 minutes that it takes to find the table, get condiments, etc, can now run simultaneously with the 10 minutes it takes to stand in line and get the food. So you start eating 5 minutes early and, thus, finish up 5 minutes early.
As far as the "what if everyone did this" nonsense, it's best to just use a little common sense and realize that these silly "what ifs" just don't happen, or if they do, then we deal with them as they come along. In the event that the restaraunt is so busy that I might be taking the last remaining table from the person who is just now leaving the counter, then Disney can have a system in place like the one described at Pecos Bills. But if we walk in there and there are only 5 families eating, then use a little common sense and realize that there is no harm to anyone by my wife staking out a seat. Too many people like to build an absolute rule based on the extreme situations which are oftentimes too extreme to even be realistic. But in my opinion, it makes much more sense just to have the general everday practice, and then deal with the extreme situations accordingly when they come along. Kind of like the issue mentioned earlier about stopping on Main Street to take pictures. Just because the extreme circumstance (needing clear pathways for the parades), should we make an absolute rule against taking pictures at all times, just because doing so would interfere with the parades? Or because "what if everyone did it all at the same time"? No, they allow the practice as a general rule, but make exceptions accordingly when the extreme circumstances arise. This is the same way we should look at the practice of staking out a table while the other person orders.
At any rate, though, even if a place is so busy as to require restrictions on staking out a table while the other person orders, I will let Disney make that decision and enforce it accordingly. If we see fit to stake out a table while I do the ordering, that's what we will do until if/when a CM tells us that we cannot.