I've only used a guide twice, both times on Lake Fork. We had our own boat but used the guides the first day of the week each time just to get some inside info on patterns so we didn't waste half our week down there on trial and error. Both times the guides fished with us.
The first time it was kind of a tough bite...a cold front had blown in and we were having trouble nailing down a pattern. The guide was fishing with us in the beginning, and once he found a pattern and got us on some fish he pretty much put up his rod and let us do our thing. He'd make a cast every now and then out of boredom I suppose, and I didn't blame him.
The second time it was just game on from the get-go. Every spot he took us to was fish after fish on just about every cast. He hadn't started the morning fishing, but after he sucked down coffee and cigs for a couple hours, and saw that we didn't need any kind of assistance, he did pick up the rod and joined the fun. I had no problem with it, there was plenty to go around.
In the case that you cited SIO3, if the bite was a little tough and the guide was hitting all the juicy spots first, I think that would definitely bother me. But in my cases where he was either trying to get us on fish, or it was just a bonanza, I don't see anything wrong with it, so I guess for me it just depends on the situation.