The mistake here in this thread by some people is thinking that your way is good enough for you, so it is good enough for everyone. Some people have higher standards though.
To the OP- If you find scanning 35mm tedious, then get a Nikon 4000 or 5000. They both do bulk scanning, and with VueScan it is pretty simple to scan an entire roll if the film is uncut. Even if you cut it, you can set up VueScan easily to start scanning when the film is inserted and spit the film out when it is done. Easy peasy.
For 120 with the Epson, if you are using VueScan enable "scan from preview" in the settings then do a preview of the entire roll with the preview resolution set to the resolution you desire. Then it is as simple as cropping each frame and hitting save. You can adjust each frame too before you save it. The preview will take longer, but you will only have to do one pass instead of a bunch.
Hope that helps you.