[mattbrewsbytes]

Talk to your manager and see how they think you are doing. You might be too hard on yourself and/or in awe of co-workers.

It sounds like you are in a good spot to soak up knowledge from people that are highly respected in their fields. Try to understand what these improvements and new solutions offer to the product. It is possible that the eager devs are just spinning their wheels and/or reinventing wheels because of new shiny libraries. If they truly are very advanced in their fields, I can't imagine your manager has the same expectations of you and them. Maybe your role is to bang out awesome work that helps them keep their brains engaged in the very advanced work they do (you didn't describe what it was but it sounds more than CRUD apps).

Another approach is to recognize you are a professional and that there are times where you simply aren't motivated. I'm sure this happens in other professions. There are days/weeks I just am bored doing what we do. Software development of business applications just isn't terribly exciting. Figuring out problems and creating things in code is fun though. Think about what brought you into software development, maybe there is an ember still there you can slowly get burning again.