Neither of the star wars rides have Fastpass, Mickey and Minnie's is opening in March and no word on FP, Slinky Dog Dash is near impossible to get one for, and then you still have TOT and Rock N Roller Coaster that are 1st tier so you can't even get FP 2 of the big-big rides that offer it.
I feel like I'm going to spend literally my entire day there in extremely long lines because there are zero FP options for all of the popular rides.
I can't even plan to rope drop some of the big rides for short lines because of boarding passes for ROTR and possibly MM, so everyone else will also be rope dropping the same few big rides and it could end up with very little impact.
I've never been to HS and I'm crazy stressed. We don't even go till June!
I sent my son (24) and niece (30) to DHS on Dec. 24th, a crowd level 10 day. They were the only Disney diehards who so much wanted to see the new star wars stuff who were willing to brave the crowds (family in Orlando, so we were there to see folks at Christmas). I was thinking the same things you were (OMG crowd level 10, everyone is there at rope drop to get a boarding group for Ride of the Resistance eliminating those great first two hours with low crowds, is it really even worth it to go). Plus tickets were $150 a person, so no wonder we just sent two out of the eleven people. All that, though, I have to say they had a really great day. They absolutely loved their time there and thought it was totally worth it. Just sharing that in case it eases your mind. Let me tell you about their day in case that ease your mind too.
Rope Drop and being there b/f rope drop to get in the park right at opening is critical to get your boarding group for Ride of the Resistance and they did that.
First of all, at least with the boarding groups for the Rise of the Resistance that isn't that long a line and goes super fast with interesting queue. They did Rock N Roller Coaster as their tier 1 fastpass (only one they could get early). They did Star Tours too right away, and then a throw away Beauty and the Beast one (doing that too), but not till later in the day. They did this to try for another tier one and did get another Rock N Roller Coaster. With the crowd level 10 crowds, though, extra fastpasses for tier one stuff just wasn't a reality, but maybe that would work on a lower crowd day These two fastfasses meant lines weren't that long for these. They did Tower of Terror as early as they could too, planning everything, of course around their Ride of the Resitance boarding group and their line for T of T was only about 20 minutes with so many others going for other things early.
The good news too is that they did Voyage of the Little Mermaid, Walt Disney Presents, Beauty and the Beast, and Muppets and those NEVER have long lines and were nice to go to even on a crowd level 10 day.
They had a about a 45 minute wait for Falcon's Run which they didn't think was too bad. The killer is if you have to do Slinky Dog. I was trying to talk them out of that one, but it was a must do for them and a good 75 minute wait (they weren't able to get a fastpass). Too me it's kind of like 7DMT (insane popularity and long lines). We subscribed to Touringplans.com, the unofficial guide people, so had a plan (sort of) because you don't know in advance what boarding group you'll get. They were boarding group 25 or so I believe.
And if you want to get a good seat for Fatasmic that is a long line too or last minute and be at the side.
DS thought Rise of the Resistance is the most impressive ride he's been on ever. They had so much fun even on a crowd level 10 day. Just saying in case this eases your mind in any way.