Just thought I would chime in here with my comments/impressions.
I personally like the fact that the top of my interface isn't cluttered with ALL the apps I'm connected to. As system/realm Admin all our apps previously spanned the entire top section. I will say that for most of our users, they currently interact with a single app, so they aren't moving between apps. We do share data between apps, but that information is presented via connected tables.
The left nav does take up some real estate but I just size it down or close it altogether. I have spent some time creating dashboards that incorporate buttons (or links) to the table(s) directly, so I can hide the left nav entirely.
I do have to say, that while I like the look and feel of the new dashboard and forms, they take up a ton of space and create "forced" size options which means I either have long/skinny buttons, or short/tall buttons. Additionally, the additional amount of "white space" built into the dashboard and forms, has caused me to split out the fields/data/reports/buttons in such a way that it does require more "clicks" to see all the objects since they are now on multiple tabs/section where previously they could all fit on a single page/pane.
We are rather new in our app build outs, so re-working our interfaces, while it did take some time, probably isn't anything compared to those with larger/multiple apps.
If the top nav old structure came back I would totally throw my vote towards the ability to "pin" or de-select which apps/tables would show across the top bar as I really don't want to go back to seeing everything.
