After 35 years of riding with toe clips and straps, clipless felt too foreign to me, even after an entire season of only riding clipless, so I went back to toe clips and straps. As for walking with cleats, cycling road shoes are not made very well for walking any but the shortest distance. Not much good if you are going to ride to the art museum or museum of natural history. They are even difficult to wear when grocery shopping. With cleats installed, and cleat covers on them to protect the cleat and the floor, the angle of the foot on the floor leaves a lot to be desired.
I have been told that Mountain Bike Shoes are different, but from the ones that I have looked at, you still need cleat covers to keep from scratching up nice floors. Bad thing about cleat covers is that you need to remember to bring them along on your ride. On top of that, what if you forgot to bring your shoes with you to the assembly point of a ride (of course this is presuming that you transport your bike to the assembly point rather than ride it)? With toe clips and straps, most any shoe will work.
The purpose of my original post was not to try to dissuade anyone from using clipless pedals. I did want to point out that there is a viable alternative and that the OP could still ride, even if they could not get used to clipless pedals. Oh, by the way, in 40 years of riding with toe clips and straps, I have never suffered any knee or ankle problems caused by cycling. So I guess that toe clips and straps, when set up properly, are biomechanically correct also. Get back to me after your 40th year of riding clipless and let me know how it all worked out for you
!