Amelia has done super well in the day home. When she first started going, she would cry and then that turned into frowning and now she smiles when we (Mr.D usually drops her off and I pick her up) take her. In the beginning, she was super attached to me when we got home after work. I couldn't put her down and walk away without her crying/whining. Luckily, that went away over the first couple weeks. She eats well and sleeps well there and is happy when we pick her up, so we couldn't ask for anything more.
I've found that I was pretty easily able to switch my brain back into work function. There are days that I definitely have to make myself a to-do list, but I haven't messed anything up too badly yet ;) I really struggled with going back to work and not having the time with Amelia, but having some adult interaction and not being "mom" for those hours in the day have been really good for me. I feel like I am a better and more patient (I have the worst patience!) mom. Being at work also means that I don't take my time with Amelia for granted- yes, the hours between 5-7pm can be crazy, but it's worth it.
The things that make the week days easier are getting everything of Amelia's together the night before, as well as meal planning. It means that we aren't struggling to come up with a meal idea while trying to feed/entertain Amelia after work. The other major thing is Mr.D- he takes Amelia in the morning while I get ready (and then we switch). He makes dinner when he's not coaching rugby and goes grocery shopping without complaining. I couldn't do it without him!