We agree with Ms. Carr.  Your message will be more effective and appear less pretentious if you simply write what you mean.  For example, in most cases it is better to write

• start or begin instead of commence

• stop instead of cease

• use instead of utilize

• try instead of endeavour

Of course, there are times when a big word is the best word to properly convey your message.  Often, the big words are more specific and precise in their meaning than the small simple words.  For example, when you refer to a farm house that is aged, falling apart and eerie, it may be better to write the word dilapidated.  Yes, that word is big.  But it is specific, efficient, and effective!