In your case, the benefits of two pairs of single vision glasses are obvious--you avoid the problems you've had with bifocal/progressive glasses. The disadvantage is that it's less convenient. But, hey, whatever works!
Have you ever heard of someone not adapting to bifocals? I feel kind of alone here. Thank you, and my wife said the same thing, What ever works.
It sounds as if you are having difficulty with the progressive or multifocal lenses. Try separate glasses for near and far, to determine whether this might help. If you have not tried contact lenses, this as well as laser vision correction may be an option for you…
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California
Deep in the archives of this website, there are a number of posts from a woman who couldn't adjust to bifocal/progressive glasses, so she decided to get ReStor IOLs. This was during the early days of multifocal IOLs, and the woman unfortunately had a poor surgical outcome. She attributed her inability to neuroadapt to her ReStors to her inability to wear bifocal/progressive glasses. (I'm not sure that there was any connections between the two issues.)
I'm sure that there are many people who prefer using multiple pairs of glasses and don't consider this to be a problem. In addition, there have been many technological advances in accommodating IOLs like the Crystalens, with even better technology yet to come. You sound like an excellent candidate for accommodating IOLs when you develop cataracts.