Yes, it is definitely more aggressive. I am glad I am not the only one that has noticed.
Based on some of the comments on here I was starting to doubt myself, so I went back and played a couple of hours on the first one. It was a lot better. I had to actually pay attention, and most often I had to recognize the enemies movements by actually seeing them rather than just following an icon.
In the second game it feels like the game play has devolved into mindlessly aiming at icons and shooting, no strategic thinking necessary. There is no need to pay attention, and almost no chance the enemy is going to catch you off guard, or vice versa.
I hope they tone it down a little. It would be nice if it were more like the first game is when no one is playing boss mode. The enemy would sometimes give away their position, but you had to pay attention to enemy movements visually and couldn't just rely on the icons. I would really like to have the chance to shoot at someone that doesn't have an icon floating over them.