I agree with Historic on the concept of not over-feeding herbs. They really don't like an overly rich, heavy, wet soil (well, mint likes wet feet, great to grow under a faucet or downspout). We usually have very harsh winters, but this year was relatively mild, and even my oregano came back! I'm aware that my parsley (which, yes, came back this year) is biennal; however, in our climate it rarely comes back the second year. I fully expect it will bolt early. I grow both types, simply because I've lived here and there, some places where flat wouldn't grow. So I grow both and like both (yes, flat has a stronger flavor, but curly is rather pretty both in the garden and some dishes).
My biggest problem with growing plants inside is that my nice, sunny-in-winter, windows are over my baseboard heaters. They can dry up and die overnight on a cold winter's night. So instead of starting inside, I've resigned myself to buying seedlings and only start short-season, easy-to-grow-from-seeds, seeds (lettuce, spinach, basil).