Stefano Garuti

This plugin allows you to directly embed Gmaps code in your posts or pages using the [gmap] shortcode.
HOW TO USE IT: 
When you are in the Write Post or Write Page screen, find the “Custom Fields” area. 
If isn’t already there, add a custom field named exactly “gmap” (without quotes) and copy and paste 
in the value field the whole code you obtained from Google Maps. 
Write anywhere in your post or page the “shortcode” [gmap]: when displayed on the blog it will be 
repalced with your Google Map. 
Save and publish. You are done!
UPDATE and NEWS at: http://www.wpmania.it/google-maps-mania-plugin/

GmapsMania

This plugin allows you to directly embed Gmaps code in your posts or pages using the [gmap] shortcode.

Fahmi Adib

WP Google Maps Shortcode – Insert Google Maps into your post or page using Shortcode.
Maps are displayed with the [wp_gmaps] short code:
<pre><code>[wp_gmaps address="San Francisco, California" zoom="7" marker="1"]
</code></pre>
<ul>
<li>Support geocoding service</li>
<li>Support latitude and longitude parameters</li>
<li>Support zoom</li>
<li>Enable/Disable marker</li>
</ul>

WP Google Maps Shortcode

While this plugin works and is simple to use, the code needs to be updated (bug fixes, improvements). For instance, this issue is 9 months old: https://wordpress.org/support/topic/javascript-bug-2?replies=1.
Also, adding a responsive takes about 5 minutes (See https://gist.github.com/SiamKreative/f38f9fefcd494b67c1ca). It SHOULD be responsive by default.



Simple but needs to be updated

Insert Google Maps into your post or page using Shortcode

GmapsMania vs WP Google Maps Shortcode