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I had glasses, too back then and for me, ECF was not reliable but not completely a failure. I guess it has to do with the strength of your prescription and how close you can get your focusing eye to the viewfinder. I had to put an effort by pulling the camera close to me for it to work properly, and it wasn't close to second nature . I had lasik some 10 years ago and I have been glass free ever since. I wouldn't mind having ECF as an option for focusing again now in a new body, that would be really great, actually.
I myself had to train a new way of shooting, too. Camera was "nailed" to my eye and I had to learn that if I did not see everything in the whole VF the sensor did not see always where my view was pointing to. But that was a matter of two days and after it worked excellent. Of course I ignored it completely when I turnd the camera away from horizontal format. EOS 5 was not able to recognice that ... - EOS 3 and follow up consumer bodies where ...