I've been journaling for a few years now and use my laptop. I write in it almost every day. For me, typing is faster than handwriting so using a keyboard allows me to pour out my thoughts as they come, rather than thinking about what I want to say and then trying to write legibly. Using my laptop also allows me to encrypt my MS word docs with a password. So no can read my journal and I feel free to write whatever I want.
What I've discovered about journaling is that writing out my feelings is a better way to process than venting to friends and family. And as my thoughts and ideas flow, I have had some amazing "aha's", which I can write down and reflect on later. Another good thing about journaling is documenting both the unusual and the seemingly normal events of the day. Some of these otherwise pass without notice, but can be important and interesting to look back on in the future.