Tri-co,
You asked 'is a ten foot rod too long?'
No, it's not.
As you can see from the responses so far, it's pretty much a matter of choice.
The 'average' fly rod runs from 7 1/2 to 9 feet long with 9 foot apparently being the prefered length for 'general' fishing of everything (based on rod sales)...shorter and longer rods are generally considered 'special purpose' or 'niche' rods.
If you think you would like a ten foot rod for fishing streamers, for whatever reasons work for you, then you should get one. You'll learn to use it just fine.
Buddy