S.L.
My 2 1/2 year old just got a big boy bed, and a baby gate at his door. Honestly, the first night it was there, he didn't freak at all. he'd moved from such a small place (the crib) into such a HUGE space (the whole house at his disposal), so a barrier to keep him from exploring the whole house actually (I could see it in his face) more comfortable with the idea. A bedroom was big enough, and any more than that was too much.
He gets out of bed after I tuck him in some nights. Tonight, he stood by his gate, arms folded on it like a cowboy leaning on his corral fence, and yelled, "Momma! Where ARE you?" and claimed to need some medicine and other marvelous inventions to try to get me to come sleep in his bed with him. I call back that I love him and to get in bed. Eventually he realizes that I'm not coming back and puts himself back to bed.
In the morning, he often stands at his gate and yells the Momma Where Are You thing, too. But I've been considering taking the gate down when I go to bed, so he can get up and come snuggle with me in the morning (we have the same ritual that you have). So you could do that.
I liked the gate idea (which someone on this site suggested) much better than my thought of closing his door and putting one of those doorknob contraptions on. I use those to keep him out of the pantry, but I know he'd feel trapped in his room. But with the door open, so he can see us (except we all hide out downstairs until he's asleep) he doesn't feel trapped at all.
Good luck!