Yes, we did that with our DS. In year 7, we did an awful lot of supervision/helping, etc., checking what homework he had and making sure he did it, helping him revise for tests, helping him draft essays, etc. Basically, he did nothing on his own and one of other of us would sit with him for an hour or two in the evening whilst he did what he had to do. We did that because he had very poor motivation and organising skills.
Thing is, though, we pulled away pretty swiftly once he was in the habit and we soon got to the stage in most subjects where he did the work himself, but just needed "prompting" (bullying!) from us to actually motivate himself to do it.
In years 8 and 9 we only "helped" with problem areas, i.e. he'd come to us if there was something specific he didn't understand. If it was a subject we knew about, we'd help directly, but if not, we'd help him research it (basically just telling him to either google it or look for you tube videos!).
For the GCSE years 10 and 11, he was fully self sufficient and our "involvement" was simply to remind him to do his homework/revision and not spend too much time of the xbox!
I don't think helping/supporting children is a problem at all. The real problem is not letting go. I expect most, if not all, kids need a kick up the bum and some help when it comes to homework and revision. The key is to step back once you've given them "the tools" to do it themselves, by "tools", I mean the basics (i.e. good literacy and numeracy), motivation to actually do the homework (kick up the bum when necessary), and to know where to look for help/support if they start to struggle.