Yup, Martha, I do like cotton batting as a rule, but I use Hobbs. I usually use the 80% cotton batting and since I use so much, I buy it on a roll now. It seems a bit expensive at the outset, but when I break down the cost to say, how many queen size quilts I can use it for, or how many baby quilts I can get out of it, the price is very, very reasonable. If I used that roll for only queen size quilts, it would cost approx. $11 per quilt. Pretty cost effective!
Anyway, I've also used wool for one quilt, but I have to admit, I haven't finished hand quilting it. It's a queen sized Double Wedding Ring. Martha, I'm sure you remember that one!
So, I have to say, when it's on my lap, it's very warm, but not heavy. It quilts so easily my hand doesn't get tired and it's just wonderful. I really need to get busy and finish it. I'm well over 1/2 finished with it. It's been years and it's time to take it out since cold weather is coming and I want to put it on our bed.
That said, since I haven't finished it and had it on our bed, I honestly don't know how it will be. I do have a quilt on the bed that I made years ago and I used cotton batting in that. I use the quilt all year round and yes, I do live in Maine. The only time it's too hot is in hot, humid weather and now that DH has the wood/water stove in the garage going to heat the radiators and that heat rises and heads straight for the bedroom. Even a sheet is too hot sometimes. Basically, I love cotton batting completely. It drapes so well, it's fairly lightweight, it's warm, but not too hot (IMHO) and it's not too expensive to use. I do wash my quilts in the washer and I usually hang them to dry, but I will put them in the dryer with no heat to finish them.
I've heard that with a lot of wool batting, one has to be more careful, but there are some new wool battings that are more durable and can take rougher handling like cotton? I don't know what brand or anything, only that I think I read that somewhere. I know that the quilt I'm working on will be washed on the delicate cycle and fluffed in the dryer with no heat. No pets are allowed in the bedroom, so it won't get very dirty.
I guess the way I look at it is, if I want something I'm not going to worry so much about and I can take care of easily, I'm going to use cotton. I used the wool on the DWR quilt because I wanted something special. Others will disagree with me and use wool all the time. That's wonderful for them, but it's not me. I'll stick with cotton, even though I've really loved the wool so far.