I'm not sure if it has just been a shift to people burying rumors and news in other threads, but in the past, the Transactions forum had some of the most activity because people were just posting and sharing rumors all the time from Twitter and other sources. Yeah, there were megathreads, but there was constant F5'ing in there during hot stove season and it was almost guaranteed there'd be fresh discussion on every rumor, that can be fixed with posting rules and moderating, though.
I love the Cubs but I love baseball just as much and the Transactions forum kept me afloat on what was happening around the league and made me feel like I had my finger on the pulse of MLB. These days due to a lack of posting there and life getting in the way of watching anything, I feel like I know as much now as I did before I started to fall in love with baseball again 20 years ago.
The amount of times I had to hear gripes from my fiance about how I spend too much time "On that stupid Cubs forum" was because I was informing myself on what happened in baseball that day. People just shared everything and it felt like an aggregate of all that occurred in baseball each day and it was awesome. I'm actually kind of shocked the Transaction thread didn't pick up steam during the offseason, made me kind of sad.