The Three Lions finished top of Group D with a win over the Czechs as Maguire made his first appearance since May.
Asked about returning from injury, Maguire told BBC Radio 5 Live: "I've been out of action for six and a half weeks now and it's been tough.
"It's been tough to watch, I don't like watching football matches so to be back on the pitch is something I love doing and to be at Wembley in the first time for me playing in a European Championship, it's a good feeling and it's all the hard work that I've put in that I've been able to play 90 minutes."
On watching England in the Euros as a fan four years ago, he added:"I was in France four years ago so it's been a crazy journey for myself and my family and my friends who were with me in France.
"I'm a passionate England fan and when I've not been playing the first two games I've been kicking and heading every ball in the stands because I want the team to do well whether I'm playing or now."
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