If our life wasn't so short, it wouldn't be such a hard pill to swallow. Depending on health and other factors you may live to 80 or a couple decades beyond. But even at 100 years that isn't much time, and for many those later years is fraught with chronic disease.
We on average spend 1/3 of our life asleep, and another 1/3 on mundane things (driving, bathing, defecating ect..). If you're a JW you spend the other 1/3 in servitude.
I think if we as a species could live longer lives then maybe death wouldn't seem so bad. Could you imagine being married to the same person for 300 years? Death would be welcomed.