I used comicbookdb for the same reason. It was so well organized. And while I couldn't find anything that well put together, I did find these two that do a reasonable job of listing character appearances in similar fashion.
This is a site that lists Marvel characters, alphabetized, in chronological appearances... https://www.chronologyproject.com/a.php
And here is the key that helps you understand the abbreviated comic titles... https://www.chronologyproject.com/key.php
Here is a website that does the same for DC characters... http://dcuguide.com/w/Chronologies
