I certainly remember that 2005/06 offseason. I made the effort to go to the dome on opening day and 50,000 people were screaming "we want BJs". It was definitely an exciting offseason - primarily because they Jays hadn't been very aggressive in previous years.
I also remember pulling over on the side of the road when the Marlins deal was made. I was in shock.
But - I think you're understating the excitement that comes from building after a simply remarkable season. The 2005 and 2012 were not good years. The was no hype or expectation for the team. Those signings/trades simply meant we might not stink the next year, whereas these signings increase the likelihood we can make another run at the WS title.
It's like we're in the 2015-16 offseason again - only this time, we're adding baby.