Sure.
Since 2011, we've seen the following done/upcoming at the parks:
Universal Resort
-Rooms at Hard Rock Cafe Hotel, Portofino Bay, and Royal Pacific Resort renovated in the past 4-5 years
-New value resort, Cabana Bay, opened
-New restaurants and entertainment facilities open throughout Citywalk, replacing less effective and profitable ventures on-site
-Miniature Golf attraction added to Citywalk
-Blue Man Group show replaced the former, then-unused Nickelodeon Studios building
Universal Studios Florida
-New trains on Hollywood Rip, Ride, Rocket for a more reliable ride
-Turned a vacant studio building into Transformers: The Ride 3D
-Built Diagon Alley in the old Jaws land
-Jimmy Neutron replaced with Despicable Me: Minion Mayhem, including the awesome post-show dance party with the minions
-Additions to The Simpsons Ride, namely rounding out Springfield with exclusive eateries (Moe's Tavern/Krusty Burger) and the Duff Beer Garden
-Spongebob Squarestore opens in Kidzone
-An family-friendly parade is added during the daytime hours
-A nightly show with lasers, fireworks, and projections is added
-Improvements to screens and animatronics of Revenge of the Mummy
-Beetlejuice Graveyard Revue updated in 2014 with a new setlist
Islands of Adventure
-Consistently updated ride profile for Harry Potter and the Forbidden Journey (most recently when USJ's version opened)
-Suess Landing (buildings and walkways) repainted
-Hulk repainted
-Toon Lagoon facades repainted and water/foam surface treatments replaced yearly
-Major 4K and visual upgrade for The Amazing Adventures of Spiderman
-Major, weeks-to-month long refurbishments to the Jurassic Park, Dudley Do-Right, and Popeye's water attractions in the cooler months
-Still pristine conditions for the theming in Lost Continent, namely around Mythos and Poseidon's Fury
-Continued attention-to-detail paid to the Talking Fountain in front of Sinbad (water effects work, stereo still good, conditions excellent)
Are there areas that could be improved? Sure.
-Fear Factor Live needs to go
-Toon Lagoon amphitheater should be used for an E-ticket in either Toon Lagoon or Marvel Super Hero Land
-Jurassic Park needs another attraction to round out the area
-Kidzone needs to be completed revamped (which I believe is already planned)
-Twister replaced (which I believe is to happen very soon)
-Terminator 3D needs a 4K upgrade and improvements to the show (which rumor has it was planned for some point, this one I'm iffy about)
But I think it's pretty clear that, once Comcast purchased Universal Studios in 2009 from Blackstone, investments in the park, on new additions, maintenance, and general upkeep, have been up considerably. I don't think there's been any doubt as to the improvements to the resort on whole whole, helping lead to its meteoric rise since 2011.