What they have put a stop to is the Paradise Pier people cutting through the GC lobby to get to the parks. They do not let you enter from the street side unless you are a GC guest. You can go in the DTD side (even if you are not staying at any of the Disney resorts), and you can go out through security on the DTD side. You also can still enter CA from the GC entrance if you are a DLH guest, but unless you have a purpose inside GC, it doesn't make much sense because you would have to go through security twice. Once to get into DTD from the DLH hotel, and then after you go through GC, you would have to go through security again, at the gate to get into CA.
We always stay at DLH and when we were there last month, we loved the security checkpoint being back by the DLH. Because there are now multiple checkpoints around DTD, the security lines were really short. It really eliminated the bottlenecks from that side of the parks, to have multiple checkpoints around DTD.