Pre-v152, you could close a door and have 10 seconds of safety. Now, a creature will immediately scratch at the control panel (a new v152 animation) to trigger a door malfunction. Your safety window: 3 seconds max.
Creatures now react to where they are standing. A stalker in the Cargo Bay (cold, metallic) behaves differently than one in the Hydroponics Deck (warm, humid). In v152, enemies will actually hiss and recoil if forced into Engine rooms with high radiation. They have preferences now.