I agree. I've been keeping work/life journals using various systems and inevitably either the tool would become unsupported, my data would get corrupted, or the 'friction' of opening the application would eventually make me stop keeping track of things.
What really worked well for me instead has been to us Notational Velocity (nvALT to be specific). I create a new note for every day (titled YYYY-MM-DD), and especially for work notes I add a timestamp for every new entry for that day (ISO 8601).
The result is one folder full of text files that I can quickly update and search through using nvALT. I can use the same app for storing all kinds of other things, but I can also use any other text editing tool for my notes as well (grep, WriteRoom, Sublime Text with markdown plugins, etc.).
Currently I moved my 'journalling' into a locally running web tool, but because the source data is just text, 'migration' has been trivial. It's quite possible I'll move back to the plain text + nvALT solution though. I usually do. I just can't help tinkering.