Switching glasses is a lot more effort than looking slightly up or down. Most of the time, it doesn't involve any conscious thought, nor any need to move the head, since it's quite normal to look down at reading material, and look up for anything at a distance.
I have a pair of progressive glasses that I purchased from Sears. The main difficulty is that since the glasses are divided up into different zones, each zone is smaller than a full-sized pair of glasses. This mainly comes into play with my computer monitors, which are larger than the mid-range corrected zone. That's why I have the computer glasses from Zenni, so I can see an entire monitor at once without part of it being blurry or distorted.
I'd never buy progressives from Zenni because they don't offer digitally surfaced lenses. Progressives have an hourglass-shaped zone where the image is clear, it's distorted toward the edges, and the middle zone is much wider on digitally surfaced progressives compared to the simple progressives than Zenni offers. It takes some time to adjust for this, initially it really bothered me, but my brain is now editing that stuff out.
I also have a pair of wrap-around distance glasses. They're almost like not wearing glasses at all because they cover my entire field of view. I like them because they give me peripheral vision, which I lack with the progressives. I do, however, find it very annoying that I can't focus to read with them, and I much prefer wearing the progressives if I'm going to read or do close work for any length of time, because I can switch from distance to close without switching glasses, which is a hassle.