Me, too. I forgot about having to change your grip half way up.I have the Deck Dolly for my 60D MMM, and I found everything about it in the previous post to be problems for me as well.
The real problem for me at my age is trying to make the lift between the deck in wheelbarrow mode to the upright (vertical) storage or blade sharpening mode. I just cannot make that weightlifting transition. So, for me the deck is almost worthless, even after adding extension handles to add 3 feet more to the lever arms. I posted pictures of this in a previous thread if you want to look for them.
I say almost worthlessbecause I can use the FEL and bucket hooks to lift it for me for blade removal, sharpening, and reinstallation. But once it's upright for storage, I can't move it. So vertical storage is limited by access to the storage wall with the FEL.