Other than masks, Dulles looks no different than it did pre-pandemic. Packed to the gills.
Sounds consistent with what I've seen on the airport's website - even much of the international schedule is back up (but who's travelling? There can't be that many people seeking patriation flights after this much time). Daily service is now available to Addis Ababa, Doha, Frankfurt, London, San Salvador, Seoul/Incheon and Tokyo, plus 3-4 times weekly (or thereabouts) to Abu Dhabi, Amsterdam, Brussels, Copenhagen, Delhi, Dubai, Lisbon, Munich, Paris, Vienna and Zurich; also weekly to Casablanca and Istanbul. In addition, United's Caribbean network from Dulles is almost back to pre-Covid service levels.