Some article I read talked about the need to have BOTH play time and holding time, for attachment and for development. In some cases, it might even be easier to maintain some of those attachment skills like eye contact when you are playing on the floor. I have stressed about this, too, but when I started observing my friends with their babies, I can see how much those babies light up when mom is playing, talking, singing to them--even when they are on floor or in a bouncy seat. That helped me feel more secure with the idea of balancing activities.
You are going to do great!
Ashleigh