The better you know your music, the easier it is to not have cue points. Remember most CDJs never had cue point options and with the exception of some RekordBox enabled models nothing that you could set in advance. And since you can’t write to CDs, you had to always do it on the fly.
Another example of how Digital DJ-ing offers a helpful feature that is a tool to make DJs lives easier and free up your time and energy for other creative things will in the booth.
As Bill said, this is a typical part of your workflow and that is highly personal.