Have you ever noticed that our feelings about the children are often a reflection of how we feel about the parents. When a parent annoys us it is like every little thing the child does annoys us and I have to remind myself the child is not responsible for how the adults choose to act.
Then of course there is the making up for poor parenting and having to deal with those children.
Personality wise some kids are just more engaging than others and while I go out of my way to include everyone some days I am just too tired so if you don't ask for what you want or care to join us for a game so what not going to do my song and dance routine to engage you.
Long term I know over the years which ones were my favourites even if I didn't realize it at the time. Some I remember by name and can visualize incidents we had happen in care. Other spots in my daycare draw blanks so guess the child didn't leave a lasting impression good or bad.