Yes, uploading statements is the way I do it. I try to do it once a week and it takes barely any time at all. Lately I'm not so good at that and end up doing it every few weeks, so it might take 1-2 hours. Most of that time is spent tracking down one or two expenditures to see how they should be categorised if it's not clear from the face of the statement. Recurring payments or payments to frequent payees are generally correctly categorised by GnuCash without any intervention by me.