He just finds it very peaceful and thrilling. "Just him and the climb" kind of language.
Also I suppose clout has to be involved: only person to free solo El Capitan, as far as I know the only person to climb Taipei 101 let alone free solo (did the spiderman guy ever make it or was he arrested?)
But it's certainly time we admit everyone feels feelings diferently. Even something basal like pain experience is hugely individual with large variation.