In my last few games of DA I've noticed that other civs are much more willing to ally with me than in DL 1.4x. I've found that developing an alliance doesn't take tremendous effort - I simply maintain trade and treaties, trade techs, build a moderately sized defensive fleet, and most importantly don't act aggressively against my neighbors.
On net, I'm pretty pleased with this. I was rarely able to develop alliances in DL. Now that I can, it much improves the role playing element of the game. I enjoy having some friends around that I can rely on, or that I can come to the aid of in their time of need. I've even had a minor (the I-League) ask for an alliance, presumably so I would could to defend them against their threatening neighbors, the Korx. Fighting off the invading Korx fleets - which I likely would not have done otherwise - made for one of my more memorable "storylines."
In any case, I'd be be curious to know if others are having similar experiences with alliances in DA, and their thoughts on the matter.