I can't speak for Bike-Pgh but can say it has been as essential ingredient in getting the right things to happen: political action, getting bike lanes installed, getting the right people saying the right things to the right other people in the right way at the right time and place.
There are ways to get around and about; see the Bike Map. There are also some known major obstacles, like:
* Wabash Tunnel is still off-limits to bikes, making it much more difficult to get south easily
* No simple, legal, safe way to get from Duck Hollow to Eliza Furnace (Jail) Trail
* No simple, legal, safe way to get downriver on the Ohio past the McKees Rocks Bridge on either side of the river
* No simple, legal, safe way to get to McKees Rocks on a bicycle, like you can to Millvale
Stay tuned. Anything worth talking about will be talked about here.