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Our design team have been using Quartus for so long it would be hard to make the switch to Xilinx.
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I think you just pointed out a major flaw yourself. Stick with the graphical tools and you get stuck in a rut. If graphical files were:
1) Industry Standard and portable
2) Played nice with version control
They would be much more usable. But the problem is they are not, and unlikely to be so any time soon. Graphical designs are a great way tool vendors can lock you into their tools. But consider these:
1. What would you do if you wanted a new job that used xilinx?
2. What if the licence server is down today?
3. What if you have some issue that is not obvious and you want to see whats changed over the last few revisions to try and nail down the problem?
4. You wanted to port your old design to xilinx.
With graphical files, you're kind of stuck if any of the above happen. But when using just HDL - you know you can mitigate all of the above with a simple text editor that you can get for free.
Graphical design has been bashed out of me after seeing several badly written graphical projects (I have also seen well made ones, but I was usually lumbered with the bad ones) and now the need to support the same code across platform. Plus, with serious usage of SVN and multiple designers modifying the project over the years, seeing the history is very useful!
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