No guarantee that it will solve that feeling, but...

If you have a commuting bike that's not like your "nice" road bike, e.g. it's got higher-resistance tires, a lesser gruppo, is heavier and just isn't as fun to ride as your nice bike then I think it'll be rewarding when you do ride your nice bike on the weekends. Why? Because your nice bike will be so smooth, responsive and will be a bike that's rewarding to ride. An end in itself rather than just a means..

If you get a mountain bike or a hybrid as a commuter than you'll really start wanting to ride your road bike whenever you can .