The average person has no idea how difficult quality teaching can be. Writing curriculum, developing lessons, making your own teaching / learning resources, presenting the content to 120 students, managing the classroom, assessing over 600 pages of portfolio content every 6 weeks, providing written and meaningful feedback, etc. etc., is truly hard work.
However, with all that said, I think God I am blessed and fortunate to work in a warm, dry and safe environment, and that other people are willing to do the other hard jobs like these fellows in my neighborhood. Maybe they love their job as I love mine, but wow, that looks hard and dangerous.