I too have been anxiously awaiting the return of this feature. The viewer feels positively crippled without them.
I consider this the main advantage that Ancestry has over most of the other sites - the ease of navigating from one record to other possibly related records. (The records that Ancestry suggests may not be for the same person, but that's fine - I find that it is always a good idea to examine all the records you can find for people with similar names and dates, to help avoid confusing two people with similar data. I do explicit searches for that purpose as well, but following the suggested links is a much faster first cut.)
Clicking through the census index one line at a time to see a side bar with related records for multiple people on the census page is faster than having to do "Go to Record" for each individual and look at the right hand side bar on the main record display for that entry, then return to the image. And the main record display only shows related records and comments, not other people who have saved the same record to their tree like the old viewer did.
(I am not a tree grabber, in fact, I do not even keep a tree on Ancestry at all, but I still find that looking at other people's trees can be helpful, if only to study the multiple different and often conflicting ways that people have interpreted or linked the same record.)