A secring is a "secret keyring" that contains a number of private keys. I agree that consistency of "secret" versus "private" would be helpful, but the concepts of a key and a keyring are distinct (and a reasonably effective metaphor IMO - you have a keyring which your keys are on). The extent to which the tools should push you towards having a single key versus rotating is arguable; people criticise GPG for being too hard to use but people (sometimes even the same people!) also attack it for not encouraging key rotation enough. A gitflow-esque helper for setting up a best-practice rotation would be a valuable thing for someone to make (and fundamentally there just isn't enough money in making these tools more usable, unfortunately, which is why I fear it will never happen).
GPG shouldn't need to tell you (prominently) where the files are because you should never need to know that - tools that integrate with GPG should be able to ask GPG where the keys are. The main thing that needs to happen here is for the Enigmail key generation bug to be fixed.
If you're looking for a good GUI mail experience with GPG integration I found KMail much nicer than Thunderbird/Enigmail, for what it's worth.
Kmail is the only GPG experience I have ever found that just worked. It has a selection of keyservers by default, and if you email someone with a key on one of them it just magically uses it like its supposed to.
Combine that with the KDE GPG manager which is also painless to generate and upload your own key, and its the only time I have ever been able to get "muggles" using GPG successfully.
GPG shouldn't need to tell you (prominently) where the files are because you should never need to know that - tools that integrate with GPG should be able to ask GPG where the keys are. The main thing that needs to happen here is for the Enigmail key generation bug to be fixed.
If you're looking for a good GUI mail experience with GPG integration I found KMail much nicer than Thunderbird/Enigmail, for what it's worth.