| Yeah, I sure feel the same way.
I think it is quite natural to do so, since once you find out that some line/groove/progression suits that song, it will become a pattern in your head and it takes less effort to repeat that pattern every time you play the song than to constantly rethink the whole situation.
And that's the challenge too. I struggle with that all the time. For example, when I'm learning a cover song, I try to think the bass line again so that I'm not just repeating what's on the original track, if possible. Some lines and songs are such that the original line just works best and in that case you should respect that. But if there's room for variation or a completely new arrangement, then it is a different case.
And I've noticed that the same patterns and progressions subconsciously repeat themselves in my playing. But as long as you realise this it's not such a big problem since you can practice that and deliberately approach the songs with very different ideas, even if all of them don't work. But then you might have learned something. | 
