Generate list of recently updated sheets

The only thing I can think of right off would be some sort of helper column (checkbox?). Use a formula that will flag whatever row is the most recently updated on the sheet. Add in the Modified By and Modified (Date) columns.

Once you set that up on all of your sheets, you can then run a report based on that box being checked.

Of course this means adding on to every single sheet in the space/folder and the report won't just grab the top 5, but it will grab the most recent row from each sheet.

You can specify which columns (Sheet Name, Modified By, Modified (Date)) and sort by Modified (Date) in Descending Order. That will put your most recently update sheet on top, and the only columns on the report would be exactly what you mentioned above.

I know this requires a lot of setup if you already have a lot of sheet and requires that you remember to add this to every new sheet and does not condense it to just the top n, but it's the closest to what you are looking for that I can think of without using a 3rd party app.