it might suggest that you have views that are quite rigid and may be based on a time when teachers were not as overworked as they are now Not sure what you mean by rigid, when I'm only pointing out that teachers should be actively part of the lesson.
More importantly, it might suggest that you are more likely to have significant authority/clout in terms of simply telling your bosses that you are doing something your way than a younger teacher may have.
I do not tell bosses I am doing things "my way," unless actually teaching the lesson is some arcane, personal activity. What I find is that quite few admin tasks are set/expected by the big boys and girls, most of whom don't teach, and they don't mind it if something isn't done because teachers are, er, teaching. Nor would they dream of suggesting that a reading period is admin catch-up time.
If you have 30 years experience of teaching, lesson planning and marking may also take you a shorter amount of time that it would a less experienced teacher
Quite likely, but it doesn't alter the fact that frees can be taken away at a moment's notice, so relying on them for last minute planning and marking is unwise, no matter how long someone has been teaching. That's what lunchtimes are for these days, unfortunately. If I fuck up on my planning, I can't take the time from my pupils.