Probably need to narrow your focus a bit. 2005 brought Soarin, Stitch and Lights Motors Action. 2006 Everest. The next couple of years featured Toy Story Mania, Monsters Inc and a few others.
The dry spell has been closer to 5-6 years. Over that time WDW did invest but probably spent too much on existing attractions rather than something new. Star Tours, Test Track, 3 Caballeros, Seas with Nemo, Spaceship Earth, Dumbo expansion, Tiki Room...all received nice enhancements but hard to compare to an entirely new experience.
As for the Universal vs WDW construction timelines, the disparity is probably not as great as some would like to believe.
Wizarding World: Announcement May 2007; Opening June 2010 (37 months)
WWoHP Phase 2: Announcement Dec 2011; Opening July 2014 (31 months)
New Fantasyland: Announcement Sept 2009; Opening Dec 2012 (39 months)
(Mine Train obviously did open later. Anyone following the situation knows that it was a very late addition, not even on the drawing table at the original announcement. But everything else including the Storybook Circus additions & re-theming, Little Mermaid, Belle and BOG were open within those 39 months--Storybook Circus was complete within 34 months.)
Avatar has has a MUCH longer timeline but that appears to be the outlier. Plus we've been teased with Star Wars for at least 2 years now--and some Pixar addition to DHS for much longer--with nothing to show for it.
Star Wars is the big domino to fall right now. If Disney announces big plans at
D23, suddenly things will be looking pretty good for 'ole WDW.