Methods for Managing/Centralizing the Entire Crypto Process?

Right now I've got coins scattered across various exchanges and smartphone apps - I've got passwords all over the place, written on scraps of paper, and saved in obscurely-titled documents on my PC that I will probably end up forgetting about.

I'm going to get a new laptop soon, and won't be able to rely on all my saved browser passwords any more. Ultimately, I need to get a good system in place.

What's your process for managing all of your funds? If you like to hold lots of different coins, how do you centralize your management of them?