We will not be in the park all day...maybe 2-3 hrs early am and 2 hrs in the evening and that will be really pushing it for me physically. Dh will be doing most of the rides with toddler. I will be looking for shady spots to sit with babe on lap but will use the car seat stroller to get from one attraction to another.
If you're only planning on being in the parks 2-3 hours at a time, can you try and plan it so your 8 month old is awake while you're in the park? DD (8 months also) stays up for 3 hrs at a time during the day usually right now (though she will do more if she's distracted, like at Disney) - then she naps. If you worked it out like that, then you and the baby could ride most of what your DH and toddler will ride, and you'd be on your way back to the hotel when your baby is sleeping, and you'd be able to use the snap n go or a regular stroller (as your DH would be able to take the baby out if you're on your way back to the hotel) - and the baby wouldn't be in it for multiple hours at a time.
Conversely, if the above isn't an option, perhaps plan being in the park while the baby is sleeping? If the baby is sleeping, it wouldn't matter if you could take the baby out of the stroller, so one of the city minis would be just fine. DD was quite comfortable in there, and easily napped for 2 hrs at a time.
By the way, if it's so bad to have your baby in a car seat, why do so many companies make strollers that fit them? Just saying. I have the answer I needed with the first response...no car seats on/in attractions...got it....no further responses needed for this thread. Thank you.
Most of us here are just trying to help you and your entire family have the most enjoyable time possible. DD doesn't mind her car seat, but she doesn't like to be in it unless she's moving. and I don't mean moving like strolling through FL, but moving at a good clip (like being in a car). in the City Mini she's more content with strolling speed (unless she's tired, then it's power walking time).
While a snap n go is very convenient, and we do still use ours pretty much exclusively at home, it would *not* have worked in Disney. I understand your desire to use it completely, but I don't think you're going to find it as easy as you think. keep in mind if you're traveling on anything other than the boat or monorail, you will need to fold up the stroller. That's going to mean someone holding DD in her car seat. I don't know about anyone else, but i can only do that for a very short time before my arm is shot, and DD is a petite 8 month old! The snap and go fold is also much more awkward than the City Mini's.
What's the harm in going to a BRU and at least testing out the city mini to see if renting one down there would work for you? You may be surprised.