I never really thought about it growing up because I was born into it - it was just a fact.
I think that we never get enough time to pursue enough things. I like learning. Imagine having a perfect mind and being able to retain what you learn. Imagine all the books of knowledge and things to learn! Or inventing, thinking up new ways to do stuff.
But on the other hand, as presented by the JWs, eternal life didn't seem like so much fun.
First off, I'd be surrounded by JWs and would have to behave. Of course I'd be "growing towards perfection", so I might learn to behave. Hell, at least Field Service would be over forever!!!!!!
Obviously any books not written by the WT society wouldn't be in the new world, so the only knowledge about real-life subjects would be from old Awakes. Not too exciting there.
And the whole world being a garden paradise? Wouldn't the scenery get kind of boring? With a theoretically stable atmosphere, all plants would be able to grow anywhere and eventually would. So it'd pretty much look the same no matter where you travelled. And since the "old world" would be gone, so would it's treasures. One of the fun things about travelling is the stuff that's part of "this old system". What's so great about Paris without the Eifle tower, or that archway, or the Louvre? Without all that, it's just land by a river.
And what of technology? Any electronic gadgets would probably be a thing of the past. After all, making electricity pollutes. Sure, we can maybe use clean energy, but what of the manufacturing of the steel for windmills or plastics and metal alloys for solar? Surely you have to pollute some. And even if we didn't have technology, wouldn't perfect minds eventually create it again?
And what about overpopulation? Eventually, the earth would fill up. What's that the elders told me? At some point, we'd stop reproducing? Well, that destroys one of the most joyful and fulfilling parts of being a human (not THAT part - hopefully that could still go on). But watching a child be born and grow up is one of the most precious things to a parent. Sort of makes everything else feel insignificant. And that wonderful joy is going to stop? At some point, we will no longer have cute little babies? That sucks.
Then there were questions about my mom and dad. My mom died and my dad remarried. My dad often gets choked up thinking about having to tell my mother that she'd never see her sons again when they're reunited in "the new world". Yeah, well that's the least of your worries. Explain that second wife of yours and why you two can't be together anymore.
The more I think about this "new world" as presented by the JWs, the less apealling it sounds. After a few thousand years, I'll bet everyone would be cynical about their life.
I think the only reason I looked forward to it was I kept hearing how wonderful it would be, but then when I'd start to think about it, they'd say "that's only speculation and you shouldn't speculate".