It must have been exciting to be a JW 40 years ago. 1975 was only 6 years away. I can imagine how these folks thought that the end was right around the corner. Think about how much popular culture changed between 1964 and 1969.
I wouldn't call it exciting. At least not for me at my age. I was terrified of "the end" because I sensed somehow that I wasn't good enough to be saved. I hoped that they were wrong about 1975. I loved the cultural revolution that was happening and I wasn't even old enough to understand it, but I knew that it was cooler than being a square, clean cut, Bible thumping, doomsday preaching, religious nut.
But for the oldersters of that time, it probably was exciting and interesting. And the revolution(s) of the 60s only confirmed to them that the end was really close. It does seem that after 75, there seemed to be less zealousness on the part of most dubs with only the oldest ones holding out hope for Armageddon before they died.