I just wanted to add that homeschooling really doesn't have to be that challenging or involve that much work on the part of mom and dad.... really most of school time is wasted so if you do anything it's a bonus and it sounds like you are already doing so much with your kids.... the only difference will be they will have so much more time and energy to enjoy all that extra you are already doing!
Being able to provide healthy food options for my children was a big motivator for me to homeschool... well, one of about a hundred or so big motivators, heh.
I so much agree with Carroll when she says that homeschooling need not be that big a deal. For my wife and I and our 2 daughters, it was, at least in part, a matter of including our kids in our daily activities. Housecleaning, dishwashing, laundry, cooking, gardening, yard work, shopping, - you name it. The kids participated according to their emerging abilities.
Of course homeschooling does pretty much require a stay-at-home parents. For our family, I was that parent while my wife supported us.
These shared activities are so much more important than most of what kids experience as they are herded through school.
In addition, we visited museums, read many books aloud, went to playgroups with other home schooled kids, joined in kid's theater productions, and many other activities.
Our favorite museums were the Living History museums, such as Old Sturbridge Village, Plymouth Plantation, Mystic Seaport, etc. A child learns so much more from freely exploring these wonderful places than he or she could ever learn at a desk. And we still continue to go back as the girls are now in their 20's (and I am in my 70's).
The only formal teaching we did was around reading. We purchased the "Sing, Spell, Read and Write" reading curriculum which they loved.
As to the feeling that homeschooling isolates kids socially, and removes them from civic responsibilities; I would say the opposite is true. It freed them up to a wider range of contacts than I ever had in school, including much more positive interactions with children of ALL ages, and with adults.
And it freed them and us up for true civic involvement, as I became involved with local politics and the girls were able to participate in these campaigns. At an early age, for example, they joined the local Food Not Bombs group and continue this involvement to this day, wherever may be in their travels.
One big benefit is that when one of our kids became really interested in something, we had the time to allow that interest to be pursued full speed ahead.
To sum up: I view our homeschooling to look much like other families lives do on weekends. For us it was like everyday was a weekend day, free to explore and do whatever we wanted.