Writing in All Caps is Like Shouting
This is why you should
- use all caps sparingly.
It is a strong effect, and it should remain one.
Imagine Someone Shouting All the Time
Not only would it mean little when she shouted, it is also more difficult to understand somebody who shouts. Similarly, text in upper case is significantly more difficult to read than lower and mixed case text.
Use Lower Case Only
If you type in all caps because you find it faster and more convenient, consider using lower case only. You will annoy some people, of course, but all in all all lower case seems more widely accepted than all caps.