Unless you're that networking guy that just massively tries to organise a thousand meetings a day on the go - I believe that a laptop is a better way to use your organiser.
I've had a lecturer at the university who still used a console-based e-mail client. He knew all of the shortcuts by heart - and I am pretty sure it would probably take me a few years to casually learn how to use Outlook/Gmail/etc.. as efficiently (and even then - most of the UI-based applications tend to somehow forget that a keyboard exists at all).
You'll ask me: "but what about mobile?". Well - the guy _never_ replied to your e-mails outside his office hours; but when he did - he gave you a proper, short and an informal answer. And to be fair, he seemed to have a great personal life.
Besides, if you are a true power-user of these tools and had been years before - there's quite a high probability that the newer tools would require quite some time to mature in order to make them a fully-functional alternative.
This is to say that I still find Calendar apps on mobile quite tricky to use as opposed to a fast "point-and-drag" alternative on desktop. I would rather open up a laptop unless I don't have it.