So far I'm liking the new dragon changes. TBF I've played one game so it's not much to go on but it was fun! I love the changes they make to the jungle. It doesn't feel too crazy but it's different enough that you feel the change.
With elder, I actually love that it's an execute (there's some bugs with it I've heard but, once those are worked out it should be nicer). When the elder spawns, I already want to hurry up and end the game. Most of my games in last season never even saw an elder and those that did were usually already decided and just a slow death.
When elder spawns, if one team is winning, they will likely get elder and finish up the game. If they don't, they are throwing their lead.
If the teams have been going fairly even, elder spawning is essentially a "teamfight here to win" beacon.
One of the more frustrating things with this past season has been games that have been decided but take another 10-20 minutes to end. If your team won't FF then that's 10-20 minutes you could've spent playing another game!
Elder drake spawning, to me, means that the game has gone on too long and needs to end. and THAT, is something I enjoy. Looking back when games took 40-60 minutes on average, the game was still fun but it was sloooooow. They added Twisted Treeline and I LOVED it because the games were so fast paced (20-30 minutes). Now TT is gone but our main mode SR now usually wraps up in 20-30 minutes. Faster games means I can play more League :)
As an aside, I find it funny how I've seen the boards complain all season at how games are decided at champ select or within the first 5-10 minutes, and now it's about Dragon executes deciding games at 35 minutes. Not a jab at OP or anyone here, just something interesting I've noticed