Definately know what you mean smatulewicz - it's as if with most of them something turns down the energy dial on them when there are kids around - we were lucky enough to have that experience with both Kintra and Keely (so far), but the rescue sites seem to prefer not to rehome many younger gsps with young kids - partially because of the unknown history but also because some of them can be so boisterous.
My dad's german shepherd working dogs, now that's a different story. They were kennelled in the garden until they retired, but i did have my legs taken out from underneath me on a regular basis as a youngster, but the funniest story i've heard (and i can remember it clearly) was being boooooiiiinged into a pond at a nearby park when my dad was walking the dogs. Apparently (and i do remember flying through the air) i was a few metres from the pond and the dog came racing towards me, hit me at full speed and i flew into the air and landed in the pond. The cool part being that i floated because i was in one of those puffy all-in-one snow suits and it must have been filled with air (i was only two - flatulence may have played a part in inflating it ).