The vilification of juniors and the abandonment of the idea that teaching and mentoring are worthwhile are single-handedly making me speedrun burnout. May a hundred years of Microsoft Visio befall anybody who thinks that way.
Unless you're running a police state environment where every minute of company time is tracked, enough opportunities for it to happen organically exist that it's not a matter of how you organize it, it's a matter of culture. Give them as much responsibility as they can handle and they'll be the ones reaching out to you.