Absolutely - it's easy to forget how important this interchange is.
Interestingly, on my (Wimbledon stopper) trains in the morning and evening recently, almost as many have alighted/joined at Vauxhall as Waterloo. This is borne out by the Underground
station usage figures show Vauxhall had a 50% fall in passengers in 2020 against 2019 - compared with Waterloo's 80% decline - so the two stations were much more comparable.
I presume that is because a higher percentage of those changing at Waterloo would be heading for office jobs - and can work from home??
It is noticeably busier than a few weeks ago, but I think we're a long way from the new working patterns being formally established. My own office is consulting on this now - the most likely option being an official move to 3-day office working (different teams on different days) and 2-day home working. That gives the 60% commuter traffic SWR seem to be predicting. (And we have yet to see what happens to the pandemic this winter...)