Majority of learning surface will come from framework and not the language, if you need Python elsewhere just learn that as well, but this shouldn't move framework choice much.
Once you get past the beginner level in Django, you're going to pick up a ton of Python knowledge (standard dunder methods, MRO, standard lib, data type's im/mutability, package ecosystem, etc.) and muscle memory along the way. Django (for the most part) is just plain old Python data structures, classes, and functions that a decent Django dev will apart, reuse, override, repurpose, and add on to as they do more interesting things. Python is boring (in a good way), however it has a lot of surface area (std lib is massive) and intricacies that a Django dev will pick up along the way to becoming an intermediate/advanced dev. It would take someone coming in fresh to Python quite a while to catch up. Naturally, if the same person knew several languages, the ramp up would be quite a bit quicker.
I just never switched to Aptana or Rubymine and now I don't wanna.
Personally I like the ruby-lsp and TPope’s Rails plugin in NeoVim.
I dislike heavy weight IDEs, I never find the juice is worth the squeeze.
On the plus side, ruby-lsp is always being improved and worked on, so just like Ruby in general it's only getting better at what it does.