Incredible, your post and the one you responded to describe perfectly how I feel. I also noticed a new environment gives me an overall boost of motivation. Changing jobs makes me super exited the first few months but after that the enthousiasm start to die off.

A result of all this is that now after 5 years of being web developer I'm already bored of the job because the small mundane tasks outnumber the challenging projects by a lot. Already switched of employer twice... Looking to do freelance work now hoping the constant switching helps keeping my motivation up.