I use my touring, grocery getting, commuting, do most everything on my old mid-90's Specialized CrossRoads bike.
Then if I'm going to do a century or something like that I pull out my Raleigh road bike. It's so much lighter and faster I have no problem transitioning to it nor do I have any problems riding it. I still prefer my Specialized CrossRoads as my daily bike as I can load it down or hit a pothole without fear of damage, which the road bike could never survive.