Can you rent a house close to your work and put on lease the one you currently have (if you have a mortgage)? That would save you time and money on gas. Your current job sounds like a dream job when having children and your employer sounds amazing. The reason I quit my job and I did not look into other companies and did daycare instead was because my previous position was very demanding. I had to work after hours, sometimes work at home and travel. If I was offered something back then like what you have I may have never considered home daycare, since I did not have a childcare degree or daycare experience back then. Also, you may want to consider that your kids are older now and in summer you may have to be doing toddlers activities instead of spending time doing activities your kids enjoy.
Well, even if your current job sounds great you may have to consider what makes you happy. Currently I think I would not go back to work outside since I really enjoy my current job, and the main deal is that I can stay all day with my own children when they need me the most (a toddler and one on his/her way)