I agree with so much of what others have said. I also have a similar work history to you; I worked bedside (but for much shorter time- only 1 year!), and disliked the work, didn't feel fulfilled, felt stressed and wanted something that challenged me in a way other than just how fast I could pass meds.
1. I love the shorter days, being on the same schedule as my husband, having all weekends/holidays and summers off. I like working independently in my office (no aide), and basically being the manager of my "department," and I like having my own office and being able to set it up and run it to my standards. I like the combination of running an office (ordering, communicating with attendance and teachers), clinical care (actual pt visits), and education/program development (developing a new sex ed program, helping to update policies manual, helping teach health classes occasionally). My bosses (two principals and a superintendent) are totally supportive and allow me to basically run my office and programs as I see fit. I like the emphasis on education rather than just medications, and the time to do it. I feel really fulfilled with my work.
I dislike the "stigma" of school nursing, or the fear that other healthcare professionals will see me as "less" of a nurse than, say, a critical care nurse or even a hospice nurse. I dislike the pay cut, but it's NOT as much as you might originally calculate because of all the time off and the opportunity to p/u work during breaks and summer. I get annoyed with the teachers or the front desk for sending me students for no reason, or making tiny issues into an emergency. I dislike hunting parents down for immunization records - this is literally my only real stress with SNing... that parents are SO bad about turning health records in, and it is a big part of our job to ensure they do. I worry that when I have kids, it will be hard/expensive to keep this job and pay for daycare.
2. Typical day is about 15-20 student visits (in a middle-high school with about 400 students), including about 5 scheduled meds/treatments, and a few "frequent flyers" with mystery symptoms; a lot of anxiety presenting physically and a lot of lingering colds that feel like the end of the world to the students... so basically a lot of education! The rest of my time is emailing, calling parents, making sure meds are complete and everything is UTD, preparing field trip backpacks, monthly AED and fire alarm checks, working on developing my upcoming programs, coordinating with other departments to set up hearing screenings or cross-departmental education (eg I guest teach an anatomy class each semester, give a presentation on drugs, give a PTO presentation on anxiety). I work get in around 7:40, open the office at 7:55 (school starts at 8am), and close up/go home around 3:30-3:45. I don't take a "lunch" but I am alone in my office so I just eat when I want and take breaks as needed. I even have a weight in here so I can do some exercises in my down time - haha! When it's super quiet, I watch educational youtubes or read MedScape articles.
3. I would have really benefited from a one-day orientation that gave the basics of the SN responsibilities, best practices, and common interventions. I basically had to figure it all out on my own. Not horrible, but certainly challenging and could have been a smoother transition.
4. If you can afford it, I would take the SN job.