I'll venture that The Ramp Area seems to have two distinct tiers as follows.

Lower Tier: This includes Hummingbird route and The Ramp route. And so we could define this tier as including any route that starts from down in Echo Canyon such as the aforementioned two plus South Ridge, Power of Words, and Sid Vicious. These are typically accessed by starting at the top of Echo Canyon and hiking down the canyon via climbers' trails.

Upper Tier: This includes The Rudder, Sick Bird, 606, 505, and Runnel Runner. Likely, the shortest and cleanest way to access just these routes bypasses Echo Canyon altogether. Instead, from the junction of the La Luz Trail and The Crest Spur Trail, head up towards The Point, find the rap down Runnel Runner (see the below photo), rap, and then strike off to your route of interest. After the rap, Sick Bird, 606, and 505 all start just on the other side of the gully (west side). 

Sick Bird, 606, and 505 are bolted routes (with lowering carabiners) and small face holds on good rock. Each route is about 80 feet. Left to right: Sick Bird (harder 10 **), 606 (easier 10**), 505 (harder 9***). 606 and 505 share an anchor. The gully is not an incredibly stable belay area for these routes.

The Upper Tier routes can also be accessed by first climbing the routes listed in the Lower Tier although some advanced study of the terrain between the two tiers would probably be helpful in linking them up.

Hill's guide (3rd Ed.) shows a "3RD CLASS GULLY" which spans both the lower and upper tiers; see feature "H" on page 170 and marked location on page 187. From the bottom, the gully starts a little up Echo Canyon from The Ramp route; further up the gully separates Runnel Runner on gully-climber's right from Sick Bird, 606, and 505 on gully-climbers left. From here, the gully continues up to The Point and is the notorious exit gully for The Ramp Route and others. Hope that your party is the only one in this gully. Climbing Runnel Runner allows a departing party to avoid the top-most part of this gully.

It is a tempting thought to rap in, stash some refreshments in/around the upper part of the gully, scramble down to climb one of the Lower Tier routes, return to refreshments and climbing of the single-pitch Upper Tier routes, then boogie out via Runnel Runner. Just consider that it may not be wise to have more than one party in the gully.