The first time I wore varifocals - some 25 years ago, I noticed that flat work tops seemed to be slightly curved but my eyes/brain soon adjusted. When I look down, the ground around my feet is clear, so no problems with steps. The only problem I have with varifocals is when shopping and I have to tip my head back to read labels on higher shelves.
My lenses are coated to help to prevent glare especially when driving the car and react to light so darken when out in sunshine.
I am long sighted so do not need glasses for driving (the speedo can look a bit blurry without them) however, my arms are not long enough to read normal print and I was always taking my single focus specs on and off - I tried putting glasses on a chain round my neck but kept knocking and damaging them.
I have regular checks with the optician but my eyes are not changing much and I haven't needed new glasses for several years so, although varifocals are expensive, I think think they are cost effective.
I agree with MerylStreep, it sounds as if your prescription is wrong. I suppose the type of correction you need must be relevant but I just wear my varifocal glasses all the time and forget about them.