The win extended Town's unbeaten run to six games and at the final whistle moved them up to fifth in the table.
That is a far cry from 14 months ago when McCarthy took over with the club rock bottom of the division.
After just about steering them to safety last term, McCarthy has the Town fans believing in a side that have lost only to high-fliers Leicester and Burnley since September.
And while he was able to deliver more good news after the win at the Keepmoat Stadium - with Manchester United loanee Ryan Tunnicliffe set to extend his stay - McCarthy warned the club about getting ahead of themselves.
"Recent performances have been good but this league is so bonkers," he said.
"You can have that good run and get in the top three but then you can lose three easily on the bounce.
"They (Doncaster) beat Leicester here and QPR here - that's the league."