Today, I briefly tried some Python IDEs (not thoroughly, I just installed them and started them once). One that caught my attention (in a negative sense) is Eric3:

I remember having seen screenshots like this from KDevelop and MS Word, but these were »artificial« ones, generated by deliberately activating every toolbar and dock window available. This is the first program I’ve seen that provides this kind of experience »out of the box«, without any configuration, at the first start.