I need to stop more often now than I did a couple of years ago.
I did notice though that when I was doing some pretty consistent riding in California, I was getting obsessed about things like average speed and stuff... I tended to ride on trails and so I was doing pretty consistent times.
Then one time I did a road ride, through an area that had several lights that I had to wait for. I assumed my average speed would be way down, and that I would be more tired at the end. However, I discovered, that the mini breaks at the lights actually helped me... my average speed increased, and I felt less tired at the end of the ride.
Who woulda thunk it????
My most humorous stop was during an organized ride when I decided I needed a rest, so I stopped on the side of the road near a cemetery and ate a raspberry newton and then got on my bike and started riding. I should have read my cue sheet, because within about 1/10 mile (down a slight hill even) around the next corner was the next rest stop.