I agree with your point in general - people get very strongly attached and a bit strange about their favorite software.  But as a software professional, I do not agree with your assertion that it's especially strong in 3D software. 

 

Counterexamples (some more historic than current):

 

Excel, Quattro Pro, or Lotus 123?

Word, WordPerfect, or OpenOffice?

Photoshop, Corel Painter, or Gimp?

Illustrator or Corel Draw?

Oracle, SQL Server, or DB2?

Vi or EMACS?  ;)

 

And, of course, the ultimate example that makes the most heated 3D software argument seem like a playground disagreement:

 

Windows, MacOS, or Linux?