hi - very slow moving thread here! I did an MFL one last year. There were more and less useful bits. Are you doing it with Hibernia/Rosetta Stone? I found I could really pick and choose what I did, which helped a lot to focus it on what I needed. Online is obviously not anything as good as talking to real life people though, and if you can organise that as well it would be much better. I sorted out some native speakers to come and eat cake and drink coffee with me so that wasn't too hard.
Workload wise it was absolutely fine. I have 2 DC but both at school, and I was working PT three days a week, and it still was no bother getting the hours in.
The workload on the PGCE is something else though !!