Yes there is a balance point between getting it done and enjoying the day. Today was a was a nice day with the sun shinning and with my dog walking alongside I just kicked back and enjoyed the day but the past few days it was cold damp and rainy so I was at full throttle and just trying to get as much done as possible. Having the ability to get it done when you need to or throttle back and enjoy the day is nice so having the bigger machine has its merits with that alone.
The other thing you must consider is that after years of running a tractor sometimes no matter the job at hand it just starts to feel like work and you just want it done sooner rather than later no matter the weather or what you have planned for later in the day again having the bigger machine to get it done faster becomes priceless.
Many jobs I still enjoy taking my time and enjoying the process but for lots of things no matter how long its been or how nice the day its still work and I just want it done as soon as possible. So much of this has to do with the job, the amount of spare time one has and what else their life consists of. I sure don't want to be spending an extra hour or two on the tractor when the weather is really nice as I still enjoy taking my motorcycle for a ride or getting in the boat and going for the day.
Also one must consider the job at hand and the toll it takes on your equipment. When you push a smaller machine to its limits you will inevitably make it wear out quicker just to get some jobs done in a reasonable timeframe yet with the bigger machine those tasks are getting doen just as quick without pushing the machine to its limits thus more longevity of the machine and this also bleeds over to the safety of the operator not being compromised nearly as much as it could be otherwise.