Two words: LIGHTNING FAST!
This used to be an awesome tool. Unfortunately, developers decided to ruin it completely with AJAX. When world finally decided that ajax is not a solution to every problem, phpMyAdmin's developers are trying to convince people otherwise. Fortunately there's an option to disable some ajax features, but not all of them. Ajax adds so many usability issues, that developers didn't think of or maybe just want to ignore. The very first principle for building apps for the web is KISS - keep it simple stupid! So no ajax, make it work with a simple pure browser, then add ajax “features” for these who really want it.