I can relate. I get bored really quickly as well, and I am one of those people who usually kicks ass at a new job for about the first year, and then starts to tail off after that because I'm bored out of my mind.
I've found two things that seem to help:
1. Start a startup. I started Fogbeam at least in part because it gives me an outlet to pursue things that are interesting to me, and a place to work on really cool new cutting edge stuff, even if my day-job doesn't. Back at my last "boring enterprise software development" job, I found that coming home and working on Fogbeam stuff helped keep me sane. (Note: in my scenario the startup is just a side project, but if you have savings or feel like raising money, I suppose you could just jump into it full time. YMMV)
2. Become a consultant. I started consulting for Mammoth Data back in 2012, and I've found that this consulting lifestyle is quite a bit more interesting than the typical "sit at the same desk, working on the same product, with the same people" routine. I'm constantly working on new and different things... every project is different, and since we focus on "Big Data", analytics, BI, etc., there's a non-stop stream of new technologies being invented / released that we have to try and keep up with. In the past year or two I've worked with Neo4J, Hadoop, Spark, Storm, Kafka, Knox, HBase, Phoenix, Couchbase, EMR, Google's Cloud stuff, Impala, Kinesis, Pentaho, and probably some other stuff I'm forgetting. The downside, of course, is the need to travel a lot at times (which is another of those "good and bad" things) and the feeling you get sometimes that you're drowning in all this new stuff. Example: In the past month or two, 3 different major companies have released distributed Machine Learning platforms (Google, IBM and Microsoft). And every day or two there's some new Hadoop / Big Data related sub-project hitting the Apache Incubator. And as a consultant, I feel a need to be on top of all of that stuff.. which, unfortunately, it's pretty much impossible to be.
Another side-note: You may find that signing up for and taking lots of MOOC's on Coursera, Udacity, EdX, etc. may serve as an outlet for your neophilia, and might let you stay more focused at work. Just treat coming home and working on a cool new class on Machine Learning or Synthetic Biology or $WHATEVER as a reward for putting in a good day of hard, focused work at the day-job.