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Neat Admin Menu allows each user of the WP Admin to customize the appearance of the admin menu.
Users can arrange the order of menu items, or hide the ones they don’t need.

Neat Admin Menu

This plugin allows each WP user to customize the appearance of the admin menu, by hiding and arranging the order of the menu items.

wycks

For WordPress 3.8 and above, enhancements to the admin interface which retain most of the core aesthetics of 3.8. It makes the Admin easier to read, especially when you have a lot of menu items.
This admin interface is adjusted for great nation of better reading abilities.
<ul>
<li><a href="https://wordpress.org/plugins/better-admin-reading/screenshots/" rel="ugc">Screenshots</a>.</li>
<li><a href="https://twitter.com/wycks_s/status/415926766130036736" rel="nofollow ugc">Screenshot when used with the admin-color-schemer plugin</a>.</li>
</ul>
Please create any issues or requests on <a href="https://github.com/wycks/WP-Better-Admin-Reading" rel="nofollow ugc">GitHub</a>
Notes:
<ul>
<li>Loads a simple admin only CSS file and adjusts the padding, font-size and seperation of menu items, it also adjusts a few other minor things.</li>
<li>Works with the new admin color schemes, you must hit save after choosing the color theme for the CSS to be applied. This is found under your user settings.</li>
<li>Makes the font smaller for tablets and mobile.</li>
<li>Works with <a href="https://wordpress.org/plugins/admin-color-schemer/" rel="ugc">Admin color schemer</a></li>
</ul>
Some of the CSS code was forked from Admin Interface by Avenue Factory

Better Admin Reading

Restores balance to WordPress 3.8's admin. Improves the admin experience especially if you have a lot of menu items.

Neat Admin Menu vs Better Admin Reading