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Reddit uses flask as part of its backend (according to stackshare.io) if you want one of the ultimate examples, but if you want to learn reddit is probably not the best example. For splitting up your routes, you need to make a module and import your filles from each other from there to split it up, so you will need to declare a __init__.py file. like this example (I know you said you didn't want them but tehy are the best example to show you).
okay ive made a quick dem sorry i know you said you didnt wnat that but I think its the best way to explain, ill work on commenting it in the morning ive been up since 2
The LMFDB (https://github.com/lmfdb/lmfdb) is flask-based, with millions of pages reflecting millions of mathematical objects. The route backend is separated into parametrized blueprints. This is a sufficiently old and large project that it is obvious that different parts were written by different people with different points of view, but the underlying flask skeleton is fairly straightforward.
Have you looked at flask admin for example i know apache airflow have been using it.