Sometime we have to design in spreads then output for print in pages. This means with a spread you have to add bleed to the right of a left hand page and add bleed to the left of right pages when manually breaking the pages apart.

It would save time if Indesign 1- split all speads into pages and 2 -
extended any image/ coloured boxes to the left/ right by the amount specified in the bleed preferences.