The first plugin I always install on a fresh WordPress site is Bulk Plugin Installation. This plugin allows you to install any plugins you like simply by typing their names or download URLs in a textarea. Here are some templates I commonly use as a start point in my web development projects:
Musician
http://wordpress.org/plugins/one-click-child-theme/
http://wordpress.org/extend/plugins/contact-form-7/
Google Analytics Dashboard Plugin for WordPress by MonsterInsights
Music Festival
http://wordpress.org/plugins/one-click-child-theme/
http://wordpress.org/extend/plugins/contact-form-7/
Google Analytics Dashboard Plugin for WordPress by MonsterInsights
[ Not in the WordPress Repository: Gravity Forms, Gravity Forms Tooltips, Facebook Events add-on ]
Blogger
http://wordpress.org/plugins/one-click-child-theme/
http://wordpress.org/extend/plugins/contact-form-7/
Google Analytics Dashboard Plugin for WordPress by MonsterInsights
http://wordpress.org/plugins/amazon-affiliate-link-localizer/
http://wordpress.org/support/plugin/display-posts-shortcode
À la carte
http://wordpress.org/plugins/wordpress-ecommerce/
http://wordpress.org/plugins/ultimate-maintenance-mode/
http://wordpress.org/plugins/ultimate-coming-soon-page/
http://wordpress.org/extend/plugins/soliloquy-lite/
http://wordpress.org/plugins/wp-gallery-custom-links/
http://wordpress.org/extend/plugins/fitvids-for-wordpress/
http://wordpress.org/extend/plugins/widget-logic/
Multisite users (developers)
http://wordpress.org/support/plugin/network-plugin-auditor