Well, we've never been a textbook/workbook kind if family, but we did cut back to just the 'Rs' last year (moving twice, pregnancy etc.) and it wasn't good for love of learning around here. We added SL in, and we had joy again!
Here's an extensive post on my blog if you want all the details:
http://quiverfullfamily.com/2011/01/13/using-sonlight-for-real/
We are on week 10 or so of Core K (started this January), and have 1+2 lined up for as soon as we're finished :).