We actually really like the Hilton Anaheim! We've never stayed at BW Pavillions, so we have no comparison. The Hilton is a convention hotel, right next to the Anaheim Convention Center, so the decor is very contemporary with no Disney theming despite being so close to
Disneyland.
The Hilton is HUGE! I believe it's the biggest hotel in all of OC. We've been put in rooms that were like a 5 minute walk to the elevators. Never again, so we always request in our reservation notes a room near, but not next to the elevators. If you stay there during a convention, some kind of tournament, or holiday weekend, the elevators do get packed and there can be a wait. The rooms are always clean. We love the beds and pillows; super comfortable. But the carpeting and upholstery in some rooms and common areas look like they could use a refresh. We've stayed in some rooms where the floor felt a little uneven. The rooms have floor to ceiling windows!
Since we're Hilton Gold members (via Amex Platinum), we always get upgraded to a high floor and occasionally we'll get a Disneyland view. If you get a Disneyland view, you're looking at DCA in the foreground, with the back of Radiator Springs and (the now retired) Paradise Pier closest to you. You'll get a view of Guardians of the Galaxy Mission Breakout to the right and should be able to see the Matterhorn and Sleeping Beauty Castle in the distance. And catch the fireworks from your room (sans report or music)! However, the park does look a good distance away and you'd probably need a telephoto lens to get a good shot from your room. (We've also gotten views of the pool and the next door Marriott.)
There's a full service Starbucks in the lobby, which is really popular and gets backed up as the morning progresses. I believe the Starbucks in the lobby is a franchise location owned by Hilton, so you can use Starbucks gift cards, the Starbucks app to earn stars, but you can't redeem stars for food or drinks, or order ahead on the app. I always wake up really early, get down there around 6-6:30 a.m., and there's no line. I'll grab coffee for my wife and me, some pastries for all of us, and fruits for the kiddo, and get ready to head out to make rope drop.
The pool area is fairly decent. There's a large rectangular pool, hot tub, and a splash area for kids. DD4 really enjoys the splash area.
We find the Hilton almost always has a better price, in cash or points, than the nearby Marriott or Sheraton, which have similar amenities. We don't think the Hilton Anaheim is necessarily the best use of HH points, though, as standard rooms can go for something like 30k HH points/night. However, Amex often has an Amex Offer for Hilton that gives $XX statement credit off room charges of $XXX. I don't remember if there are any Amex Offers for Hilton right now, but they may come around again in time for your stay. If you have the Amex Offer on several cards, ask the front desk to do a split tender and try to maximize the credits. Hilton points may be wildly inflated, but they're also easy to earn with a cash stay and all the promotions going on at any given time. When you stay at a Hilton, be sure to sign up for as many of their promotions as you can find because you can earn lots of points this way. I think we usually sign up for 2 or 3 different promotions that earn bonus HH points for every stay.
Self parking is $16/night. There are pretty hefty resort fees and taxes. That's pretty typical of the chain hotels.
My wife and I have been going to Disneyland pretty regularly since 2009 and stayed at the Hilton a lot. During that time, we've racked our brains and tried various ways to shorten our trip from the hotel to the parks and back again.
• There's no shuttle between the Hilton and DLR. There is the ART shuttle that runs throughout the Anaheim Resort area. And the Candy Cane Inn and Anaheim Majestic have grandfathered shuttles direct between their hotels and DLR.
• I think the fastest way is just to walk it. There's a side service street along the front of the hotel garage that connects to Katella, make a right on Katella, then cross the street at Harbor (in front of the CVS), all the way to DLR's eastern gateway. This takes about 10-15 minutes, and maybe another 10 minutes at bag check. Harbor in the morning is a nice walk along tree-lined streets and you'll see lots of families and couples doing the same walk to DLR. At night, it can get a little sketchier with people hawking wares, begging for change, or passed out drunk at bus stops. We've never felt like we were in any danger.
• We've also tried taking our car and parking at Mickey & Friends (since we have Signature APs with included parking), but it's about 5 minutes to the car and out the garage, another 5 minutes or more to the theme park parking lot, then it might be backed up, then you have to find parking, then down the escalator to the bag check, another 5-10 minutes, then a 5-10 minute wait for the tram to take you to DTD. This all could easily take up to 30 minutes or more.
• Another alternative is to walk across the street on Harbor into the Toy Story parking lot, which takes about 5 minutes, maybe a bit more, line up and take a Disney shuttle bus to the bus drop-off at the eastern gateway near bag check. But the walking and waiting for shuttles adds up, and I don't think you're saving much time, if any, over just walking to DLR.
• Something you can do is walk from the Hilton to DLR in the morning when you're fresh and full of energy, then take the Toy Story shuttle back at night when you're legs are tired so you only have to walk from the parking lot back to the hotel.