My ideas are separated as several notebooks , few folders, some whiteboards. But hope to organize them soon by getting a Surface like laptop (Pity Microsoft Surface isn't available worldwide but a decent tablet/laptop like Samsung TabPro S or Acer Switch 12 Alpha with 1440p 3:2 IPS screen and pen will solve most of my issues.)
Now I remember. While I mostly at my PC (hence, Essential PIM) OneNote is easy to use on Surface. With typing and drawing using surface pen.
but i mostly use EPIM for game ideas, as I mostly play games on the PC.