Agree BK. Ds started last year and it's certainly been a hard adjustment for us.
And we are so lucky in many ways. My job is incredibly flexible and I am at home too days a week so I can be around to drop off and pick up. I have made it to all the perfomances, assemblies, sports days etc.
We are lucky in that dp is a teacher and works part time so that the holidays are covered, although as he works in a college the holidays don't coincide perfectly. We have a great childminder who does the drop off two days a week and my son loves being with her - two of his friends go there too. He goes to an excellent after school club twice a week, again with friends from school.
But it's still a wrench. The older my son gets the more I realise it's me he wants. He wants me to help out in his class. He wants me to be the parent who goes with the class on the trips (I have managed one of these). His after school social life needs some arranging too and I have to make sure I keep tabs on his friends and reciprocate the playdates etc. He wants to do some after school activities that he just can't do as we are not around to take him.
Hard work too just to keep up with the demands of school, what my son needs on which days, getting the homework done, getting the forms filled, money paid for trips, even making the lunch which I didnt have to do at his lovely nursery! I spend at least 45 mins each evening retrieving stuff for him for the next day and making sure everything is in place for the next day.
I think if you are not at the school age everyday you can feel disconnected from the school - I try to alleviate that by being involved as a parent governor (easier for me to attend meetings in the evenings) and by supporting the PTA and actively getting involved in events etc.