Can I use the Thai immigration line with my Thai wife if I have an O-A visa?

Yes, you can use the Thai immigration line with your Thai wife if you have an O-A visa. Many users in the comments confirm that it is permissible and that it's often a quicker process. Some mention that even if traveling alone, having a pink ID card allows you the same privilege. The pink ID card is available from your local District Office and acts as a Thai ID for non-residents.