Depends on your definition of "just fine".
My YJ had 30s....30s! and I could do 60 too, but it was in 4th gear (sometimes 3rd) with the poor thing revving to high heaven, and any hill mean't I was saying goodbye to 60 in short order. I had to floor it to get anywhere and clearly took its toll on the motor as it died at 145k miles, and it made no difference in power after it was rebuilt, same old gutless 4 popper, just shinier.
low elevation with relatively flat roads down here in houston. Driving in Utah, Colorado and Arizona was an absolute nightmare. I had semis passing me uphill.
you may get used to and/or accept the 4 banger, but you never "love" it.
Just fine I mean in 5th gear with the gas not pinned to the floor. Small hills I can pin the gas or down shift to 4th. There is a big hill that I have to do 45mph up in 4th or some times 3rd depending on traffic and the run I can get at it, but I just get in the right lane, unless there is a semi because I would pass him.
My Jeep never sees north of 3,500rpm on the big hill, I could carry more speed up the hill but don't want to ring out the motor. I shift between 2,500 and 3,000rpm even on the freeway, the Jeep does cruse at like 2,800rpm in 5th though. My speedo is not corrected for the tires so I should be doing about 65-70 when my speedo says 60. Which is strange seeing as you could not keep 60 on 30's which would not be off by nearly as much as 33's. I have 168K on my motor and it runs fine, it does not even leak oil because I just had that fixed, as it was leaking before the lift/tires.
And I can tell you that I do not get used to or accept my Jeep I "love" my Jeep.
It could be that I have no armor on my Jeep just an after market swing out, or the fact that I am running A/T's at discount tire's recomended 35psi (they wear just fine) not M/T's at 28psi, or that I have a soft top and half doors not a hard top and full doors, or the fact that I wash the mud off my Jeep to prevent rust and consiquently keeping weight down, or maybe a sport bar weighs less then a family bar? I am the only one in my Jeep most of the time and weigh 140lbs, I weighed my Jeep at the dump once and it weighed 3,340lbs with me in it and a full tank of gas, what did your Jeep weigh? Or maybe I just have an abnormal 2.5 or maybe everyone else just has rotten apples?