Really, it depends where you live and where you want to go. If you live in Sheffield / Linconshire / S Yorks and want to travel to eg Amsterdam, Brussels, Alicante or Dublin, DSA is now your fastest option if you are driving or getting a lift to the airport. The security queues at DSA are always manageable unlike eg Manchester, where it only takes a few late arrivals to create a 30-minute bottleneck at passport control (as I experienced last week).
I don't understand your statement that travelers can use the new link road to access "actual real airports". Care to explain?