Just as the other user said, it has some basic benefits such as getting more contact with a rich vocabulary and the language in general.

But there's also a subjective benefit imo. For me at least reading is both fun, healthy and an active habit. When I spend some time reading I am able to push away depression and usually get more active overall, more well-disposed. It gives me a feeling that I have done something both enjoyable and productive.

I also, for whatever reason, get more thoughtful and able to articulate better during the periods I read. Even my dreams seem to become much more vivid in that period.

I think that being such an imaginative habit it might be good for the mind.