A.H.
I'm coming at this from another perspective...I'm a single mom, so full time daycare is the only option for me. I don't necessarily like it, but it has to be done. Even though I'm not with my son all day every day, I still feel like I'm the primary caregiver. Yes, another person keeps him during the day, but he doesn't want to leave me when I drop him off and practically flies to the door when I go to pick him up. When I take him home, I'm the one that takes care of him, gets him ready for bed, gives him a bath, feeds him, takes care of him when he's sick, plays with him, etc. Don't feel like you're letting go of most of the caregiving because you send him to daycare while you work.
Also, have you thought about trying to find a job with an on site daycare facility? That way you could pop in during the day and at lunch. If you can't find one on site, you could look for one close to your job so you could spend your lunch break with him. Do you have any friends that are stay at home moms that might want to try child care? Try to look at all the options and see if one might work for you. Even if he does go to daycare full time, he's not going to replace you in his mind, you'll still be Mommy.