Napoli looked set to push Juve all the way by closing the gap to one point with a 1-0 win at the Allianz Stadium last month, but a defeat to Fiorentina and a draw against Torino proved fatal blows in their challenge.
Although the Turin giants' hegemony remains intact, the veteran centre-back was delighted to see Napoli stop their latest win from being a procession.
"We go into the history books after an exceptional year," Barzagli told Mediaset Premium.
"It wasn't easy, but we did a great job and will now celebrate with our fans. The most recent Scudetto always feels like the best, but seven in succession really is historic.
"Napoli had a very good season and maybe both of us deserved to win the title, but together we made Serie A captivating for those abroad once again. Perhaps the difference was that we were more consistent."
Barzagli's contract is set to expire next month, but the 37-year-old does not intend to hang up his boots.
He added: "Next year, I think I'll still be here battling away."