Between chapter breaks, yeah. The very last stretch of the game checkpoints your progress every couple of seconds as well. But those are the select few times were the game very much does diverge from its core gameplay loop, and that gameplay loop literally consists of nothing but finding and reaching the next save station without being eaten while working on your objectives. Over and over. If you could just run across the map while hitting checkpoints, the need for careful planning would have been gone. The Alien would repeatedly catch you of course, but it really wouldn't matter because chances are you've probably crossed some invisible line on the way. That's also why using a save station takes a couple of seconds. If it didn't, you could just make a dash for the next one, slam a button and be okay.
The fixed hard saves are an integral part to the game's design.