I dont know how anyone can say that it is harder to get on a tractor with a cab. The tractors are the same height regardless of cab or open station and most cab doors have a hand hold to help get you up the steps. My brother in law had knee replacement and he has trouble climbing up on my P7010 LS tractor but the deck is about armpit high compared to his little T 2030 NHwhich is somewhere between knee and waist high. Both have cabs and both have no restrictions to entering other than the NH which only has steps on the left side whereas the LS has steps on both sides but I usually go out the left anyway due to all the FEL controls on the right.
It is just so nice to be able to turn on the AC or the heat and work in comfort regardless of the temps or rain, sleet or snow, you will be dry and comfortable. Tree work is simple, trim the limbs so they are above your cab which you should do anyway if you have a ROPS. You dont want that hanging on a limb either so it is just a matter of care to make sure you have clearance or cut the limbs so you do.