It’s great to hear that live templates are helping you out! I can’t see any reason why you shouldn’t use them, and I think any developer who sees you use them frequently to boost your productivity will be amazed rather than frown on it.
If you want to generate even larger things, templating tools like
Cookiecutter might be useful (note that this is just one specific example of such a tool that I’ve used in personal projects before). For example,
here’s a repo that contains a Cookiecutter template that generates an Android project.
Tools like this are usually not IDE and Android aware like live templates are, they just create new files and do simple text-substitution, but that can work for a lot of different things around an Android project.