Have stayed at Cumbrian Lakes before and it is very nice, although they were still building on the development when we were there.
Poinciana Boulevard is a very long and sometimes busy road, however the traffic moves fairly quickly, 50 mph or so most of the time.
I would say from the junction of the 192 it's 10 minutes or so to the CL entrance, you will see many other developments such as Indian Point, Liberty Village etc down there.
The nearest Publix is at the junction of Vineland Road on the 192, pretty convenient, with restaurants, Old Town etc within easy reach too.
Distance to Disney probably 20 minutes or so, Universal through the I4 about 30.