I have 3 Raspberry Pi's (so far... more going to come...).
I created a resource website for a number of projects that I am working on for the Raspberry Pi:
http://rpi.tnet.com
I personally, was not thinking about using the RPi as a weather station system... I currently have a full workstation dedicated to do that with my Davis Vantage Pro+ station as it does more than just look at the weather station.
One of my "projects" is more along the lines of an environmental sensor package using an RPi... Temp, Humidity, light, motion, moisture with a WiFi headless package. Kind of something you would put in a data center to detect for issues that might harm the servers...
However... weather... as a weather processing device, I think it would be very good for dealing with just weather input it would be pretty good for that. Basic processing of the data to be either sent or picked up by another system/server for processing and display.
Separating the collection of the data into output log files, and having the display fuctions done by other processes makes a lot of sense to me.
I know there are people that like to stare and the console for hours on end watching the wind speed change, direction of the wind and the occasional change of other weather data... I just use my phone or a browser to look at the result info... updated once minute is more than enough for me.
From my point of view, I rarely every watch the console of the weather stations I use.. (Weather Display and Cumulus) as I look for the data on the website. So the lack of anything but a basic text interface with simple commands to start, stop, reset.... is more than enough for me. Note that my current weather processing workstation is headless... so no console to really look at unless I VNC (RealVNC) into the box.
In a mobile setting, the low power needs of the RPi would be great at collection from a station mounted in a vehicle or remote location.
Creating a simple data collection system without a graphical GUI should be pretty simple I would think. There is code for a number of weather stations in some other packages.
Makes sense for the separation of the data collection from the actual display functions assuming you even want those.