Gary Bowyer was relieved as Leon Best's last minute equaliser saw Rovers claim an opening day point.
The Rovers boss felt that his side deserved so much more on an impressive showing at Pride Park.
Ruben Rochina, Jason Lowe and Jordan Rhodes had all gone close but it was the home side who lead at the break as Johnny Russell converted a 42nd minute penalty after Alex Marrow had handled.
Rovers continued to press in the second half, Leon Best twice hitting the woodwork whilst an Alan Judge free kick was headed off the line. Then Jordan Rhodes twice had decent shouts for a penalty waved away by referee Stuart Attwell.
However a minute from time Rovers grabbed the goal their play so richly deserved, Leon Best scoring his first goal, turning and volleying home Chris Taylor's centre.
"We should have got three points," said the Rovers boss after the game. "We were that good today.
"I thought we started very very well but unfortunately the injury to Rochina just rocked us a little bit.
"But overall if you look at what we've done, we've hit the bar, we've hit the post, we've had chances cleared off the line and we've played the better football against a team that only lost three at home all last season in the Championship.
"You the character, the spirit and the desire that has been questioned about these players before and they shone through today.
"They were a credit to the club, it is the start of a rebuilding process and it is a decent start and I felt we deserved more."