I'm glad you had such a positive experience - and I hope you're able to keep in touch with the others in the group.
Precana is a great concept - the Church is a community - and in very simplistic terms, PreCana is your community's way of helping you prepare for this step in your life. On so many macro & micro levels, this process is a very positive thing for the community (religious or not)....
Only a fraction of it was about spirituality - a big part are practical life stuff that applies regardless of religion - finances, future goals, running the household, children, communication, respect, expectations.....right down to who is going to cut the checks & who folds the laundry! Very practical & very worthwhile.....