Olive used to go into the crib awake from 8 months - 15 months. Then she got sick and started fighting naps so we started rocking her to sleep. She passes out so fast! I miss the days of plopping her in her crib and we'll probably go back to that once she's completely better (she still has a runny nose). But since she is still sleeping well with the rocking, it hasn't been so bad.
If you do rock your lo, do you do it when they're much older? I don't know because Charlie always went into his crib awake!