Hi Beckybendylegs:
You know I think this really depends.
For instance does your school provide feedback and correct incorrecct answers/ spellings and return them to your DC to check through? Ours just puts on a sticker and occasionally (1 in 10 homeworks - usually more) writes a comment. I have let maths homeworks go in with wrong answers just to 'test the water' but nothing. No comment to my DD and nothing sent home, just move on to next topic in maths. At our school at least it seems to be about giving it and recording it's been done - but isn't about understanding it, using it to monitor progress and adjust teaching, etc...
So, first off I'm a working Mum, although 3/4 time.
Second like you I did my own homework absolutely unaided by my parents (although provided with a drink and a snack - and occasional help with spelling a word) when I was at school.
But.... and here's the catch.... DD1 honestly couldn't do what I'd have expected a late Y2 child to do in maths and reading. (Then I double checked with teachers who are friends but work at other primary schools - a neighbour and two friends from ballet and they agreed 'DD1 was 'not where she should be'). I was convinced the problem was explanation and practice (or rather the lack thereof in both cases). I got involved and frankly I've been ghost teaching DD1 and DD2 for the last 2 years.
DD1 has now moved on to doing her work herself. I remind her it's time to do it and provide snacks but generally I am doing my bit with her younger sister (DD2 Y3) these days (which includes helping with timing & reading music with a musical instrument practice).
I'd love to have sent my kids to a school where this much involvement wasn't necessary but the consensus view (mind you from teacher friends as well) is that this is what you have to do these days, if you want your child to do well. The interesting thing is that friends from work with DCs in fairly highly regarded private schools in this LEA also appear to spend as much time supporting their children - so at least it isn't a state vs. private thing.