played Seatac in '08 and it was soooo good when we got a piece of land offered to us to build a longer course Seatac was front and centre in our minds when we put the layout together.... 4's and 5's were new to us and the tight fairways inspired us to make the target golf that became the Fir Meadows course in Courtenay BC Canada..... Seatac made us take note that the big layout is very appropriate if you have the land.
Some holes on some courses are very tough but the hardest and longest holes are safari holes. I have never played a hole on a course longer than par 5. I think the worst score I ever recorded in a tournament was 11 (the Island hole at Grand Ledge in big wind). But I have played safari holes whose par ratings would be in the 20's and 30's. I have probably played individual holes which played longer than some short courses.
One year, after a winter blizzard, a few hardy guys showed up for a league at Kensington (Milford, Michigan). The parking lot for the course had not been plowed so we parked a half mile away in another lot and played the half mile, cross-country, to Hole #1. The snow was waist deep. Just walking in that stuff was exhausting. Throwing was tough with no run up, heck you couldn't even take a one step throw because the snow was so wet and heavy.
After playing at the USDGC, which has artificial Out-of-Bounds ( yellow rope) on every hole, I went back home and designed a crazy long hole (to practice those type of shots) which played down and back a walking path then to a practice basket. On the first drive the walking path and everything to the right of it is OB. On the next drive the walking path and everything to the left of it is OB. So on every other drive the opposite side of the path is OB. Every drive if risky: you need to gain distance but want to keep it close to the OB line (the farther off the line you are the less distance you gain and the farther back you must cross on the next drive).
To find the thickest spots in the rough just play skip-a-basket format ( tee pad #1 to basket #2, for example). I have been in the middle of safari holes and found swamps or thickets which were so nasty the whole group just picked up and walked to the next tee pad, abandoning the hole.
Some courses it works very well to play backwards 2 holes. Example: shoot 18 to 16, then 17 to 15, then 16 to 14. Doing this you have short walks from basket to teepad (same as normal at least). Probably won't make a tournemant (criss-crossing). Best to play on an empty course so your not throwing at people (glow golf). This discussion really makes me wanna play disc golf.