Not much of a gamer here, but I DO still play Tiger Wood's 2008 for a round almost every evening on an XBox-360. I've beaten everything to compete for on the game...but I just love the game-play. I've tried subsequent versions of the game and other golf games and none are as good as 2008. In fact the last time I looked around, most new games were not serious golf games, but cartoonish for children, and the serious games were bieng reported as ridiculously hard to the point of hating the game for many people.
I've thought about upgrading but would have to do some research, like you, on whether its actually worth it. The last thing I need is to be enabled online for playing again. I lost portions of my life playing Quake2 back in the day. I would make excuses for leaving work early, go home, draw the curtains and start drinking and playing in the afternoon and have to tear myself from the computer at 3AM to get a couple hours sleep!
I give myself an hour or so nowadays, that's it. I have stuff to do!