As the responses on this thread clearly show, belief in the end coming in '75 was largely dependent on the congregation you were in. In some cases, whole congregations were divided.
I was just coming into "the truth" in '75, but there was lots of talk about it, especially early in the year. I remember a speaker one Sunday counting down the time until Armageddon; he had it all figured out, so many days, hours, minutes, until Oct. 5-6, or some such date. He told the audience there were only so many days left and they we'd all be in the new order. You could have heard a pin drop. Afterward, I asked one of the elders about it and he told me the speaker was out of line and should not stated his own opinion as fact; he further implied "the brother has been talked to" about the matter. I'd been studying for a few months and this was my second or third meeting. I asked him for more details, and he just said that "some" people had come to this conclusion based on some bible chronology and not to worry about it.
After that I began to notice the members of the congregation fell into two camps. Some wouldn't buy a house or make a doctor's appointment or put their kids in school, because there were "just a matter of months left in this old system." Others pointed out that the Society was purchasing new presses and real estate and took a philosophical approach: Plan ahead but keep living with a sense of urgency.
It's the same today. There are two kinds of witnesses now; those who expect the end to come soon, and those who don't. The former tend to be arch-conservatives and extremely strict in their interpretation of bible doctrine. The latter are much more liberal in their outlook and laissez-faire with respect to "the rules."