I really like all 3 of your suggestions. To add to your third one, it'd be nice if the Plan to Watch section included the number of episodes as a column that could also be sorted.
I feel like I need to re-research each time I go to my Plan to Watch list. The number one thing I am looking for is episode count. Having the number of episodes readily available would be a big help. Like it'd help with planning what to watch next because you could quickly determine if you can safely binge-watch something before Monday rolls around or whatever.
Not that I would binge-watch a 54-episode drama in 2 days or anything. Ahem. I learned my lesson. Maybe. Take this as a plea for help. =D