You know she is happy in your company, when she is looking at you and laughing at your jokes.

"OMG you are so funny.
 I can LOL all night listening to you."

When girls/women say they like guys with

a good sense of humor, do they really mean it?

Humans in general enjoy humor. But some people desire something
more than humor, as a key to being attracted to someone.
I personally look for a few key traits in my partners.
Such as compassion towards others, a strong work ethic,
and a passion for a hobby, or venture. I know that one of
my female friends was always attracted to the guys that are more distant,

she told me. She said there is something mysterious
and desirable about these types of guys. She claimed that
she  wants to be the only person in the world that he shares his secrets with.
When he finally opens up, “you are the only two persons there in that connection
and he treats me like a queen because of that.”

I, for a while in college , was interested in a girl that had a lot of home issues.
She was always reserved and cold to others. But we became friends easily.
After she opened up to me..... made me just wanted to take care of her.
I wanted to make her feel safe, loved, and confidant.
It eventually never amounted to anything serious,
but I felt this desire to be close to her, for good while.
She shared so much with me and I wanted to be her savior.
To be A knight in shining armor, for the lack of more modern day label.
While in an other case   I had a girlfriend who wanted someone that
was more serious.
You might not be taking into account the maturity of those other characters.
Some guys are  very immature. Or they get emotional easy,
fights with others over girls/women, and are loud. MOST women that
I have personally encountered did not like immature guys.
That’s why you see many women that date menthat are older than them. For example, I dated a girl that was

a Sophomore when I was a Senior in College.
She said she was attracted to me because of my seriousness.
And her room mate dated a guy that was a Senior as well,
when she was a Freshman in college, even then she found
him too immature for her. LOL… this proves that maturity
 levels are different in all individuals. But he was funny so
there was that silver lining. I am guilty of saying this a few times,
to an extent. Because everyone knows life doesn't always go  
as planned, no one is going to fit your little checklist and when
you fall in love, You won't care about that checklist for long!
You fall in love regardless.

Love never really works out so that all your little boxes are ticked off,
so don't worry about it. But to answer the header  question,
by a “good sense of humour” , I have always meant it
(and all my friends) as a trait indicative of other
desirable personality traits.

Final thoughts:

A humorous person is generally thought of to be (and I am aware
these are just generalizations, and many are untrue):
More positive — which is desirable when looking for a long term

relationship where you will be going through ups and downs

• More flexible — a good trait that anyone can aspire too, makes for an open mind
• Quick witted — the stereotypical clever, tall, dark and handsome man
• More sociable/fun — personally, I think that this particular connotation is total BS because it just depends on your sense of humor and introverted people can be just as funny( they will surprise you, because you will not see it coming.) Easy going — again, a relaxed person is generally thought of to be better in stressful situations

But this is just hypothetical. No one is actually like this (and everyone knows it)

To be honest, you shouldn't worry about it because the more you try
to be funny, the less you actually are. Everyone is humorous, to a degree,
whether they know it or not, and if you just enjoy yourself then
you will meet the right person, and make them smile.

Good luck!